Calculate age given the birth date in the format YYYYMMDD

Question

How can I calculate an age in years  given a birth date of format YYYYMMDD  Is it possible using the Date   function   I am looking for a better solution than the one I am using now    x000D   x000D  var dob    19800810   x000D  var year   Number dob substr 0  4    x000D  var month   Number dob substr 4  2   - 1  x000D  var day   Number dob substr 6  2    x000D  var today   new Date    x000D  var age   today getFullYear   - year  x000D  if  today getMonth    lt  month     today getMonth      month  amp  amp  today getDate    lt  day     x000D    age--  x000D    x000D  alert age   x000D   x000D   x000D

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The below answer is the way to go if the age is just for display purposes  Might not be 100  accurate  but atleast it is easier to wrap your head around function age birthdate     return Math floor  new Date   getTime   - new Date birthdate  getTime      3 154e 10

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That s the most elegant way for me    x000D   x000D  const getAge    birthDateString    gt    x000D    const today   new Date    x000D    const birthDate   new Date birthDateString   x000D   x000D    const yearsDifference   today getFullYear   - birthDate getFullYear    x000D   x000D    if   x000D      today getMonth    lt  birthDate getMonth      x000D       today getMonth       birthDate getMonth    amp  amp  today getDate    lt  birthDate getDate    x000D        x000D      return yearsDifference - 1  x000D      x000D   x000D    return yearsDifference  x000D     x000D   x000D  console log getAge  2018-03-12     x000D   x000D   x000D

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Some time ago I made a function with that purpose   function getAge birthDate      var now   new Date       function isLeap year        return year   4    0  amp  amp   year   100    0    year   400    0             days since the birthdate       var days   Math floor  now getTime   - birthDate getTime    1000 60 60 24     var age   0       iterate the years   for  var y   birthDate getFullYear    y  lt   now getFullYear    y         var daysInYear   isLeap y    366   365      if  days  gt   daysInYear         days -  daysInYear        age             increment the age only if there are available enough days for the year              return age      It takes a Date object as input  so you need to parse the  YYYYMMDD  formatted date string   var birthDateStr    19840831       parts   birthDateStr match    d 4    d 2    d 2          dateObj   new Date parts 1   parts 2 -1  parts 3       months 0-based   getAge dateObj      26

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I used this approach using logic instead of math  It s precise and quick  The parameters are the year  month and day of the person s birthday  It returns the person s age as an integer   function calculateAge year  month  day            var currentDate   new Date            var currentYear   currentDate getFullYear            var currentMonth   currentDate getUTCMonth     1          var currentDay   currentDate getUTCDate               You need to treat the cases where the year  month or day hasn t arrived yet          var age   currentYear - year          if  currentMonth  gt  month                return age            else               if  currentDay  gt   day                    return age                else                   age--                  return age

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With momentjs      The difference  in years  between NOW and 2012-05-07    moment   diff moment  20120507    YYYYMMDD     years

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If you need the age in months  days are approximation    birthDay 28  birthMonth 7  birthYear 1974   var  today   new Date    currentDay today getUTCDate    currentMonth today getUTCMonth     1  currentYear today getFullYear       calculate the age in months  Age    currentYear-birthYear  12    currentMonth-birthMonth     currentDay-birthDay  30

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I would go for readability   function  calculateAge birthday       birthday is a date     var ageDifMs   Date now   - birthday getTime        var ageDate   new Date ageDifMs      miliseconds from epoch     return Math abs ageDate getUTCFullYear   - 1970       Disclaimer  This also has precision issues  so this cannot be completely trusted either  It can be off by a few hours  on some years  or during daylight saving  depending on timezone    Instead I would recommend using a library for this  if precision is very important  Also  Naveens post  is probably the most accurate  as it doesn t rely on the time of day     Benchmarks  http   jsperf com birthday-calculation 15

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Works perfect for me  guys   getAge birthday        const millis   Date now   - Date parse birthday       return new Date millis  getFullYear   - 1970

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Calculate age from date picker               ContentPlaceHolder1 dob   on  changeDate   function  ev                  this  datepicker  hide                   alert   this  val                 var date   formatDate   this  val          2010 01 18   to   1990 4 16                var age   getAge date                    ContentPlaceHolder1 age   val age                     function formatDate input            var datePart   input match   d  g           year   datePart 0      get only two digits         month   datePart 1   day   datePart 2           return day         month         year                alert formatDate  2010 01 18           function getAge dateString            var today   new Date            var birthDate   new Date dateString           var age   today getFullYear   - birthDate getFullYear            var m   today getMonth   - birthDate getMonth            if  m  lt  0     m     0  amp  amp  today getDate    lt  birthDate getDate                   age--                    return age

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Clean one-liner solution using ES6  const getAge   birthDate   gt  Math floor  new Date   - new Date birthDate  getTime      3 15576e 10      today is 2018-06-13 getAge  1994-06-14      23 getAge  1994-06-13      24  I am using a year of 365 25 days  0 25 because of leap years  which are 3 15576e 10 milliseconds  365 25   24   60   60   1000  respectively  It has a few hours margin so depending on the use case it may not be the best option

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Alternate solution  because why not   function calculateAgeInYears  date        var now   new Date        var current year   now getFullYear        var year diff   current year - date getFullYear        var birthday this year   new Date current year  date getMonth    date getDate         var has had birthday this year    now  gt   birthday this year        return has had birthday this year           year diff           year diff - 1

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function change        setTimeout function            var dateObj         new Date                        var month           dateObj getUTCMonth     1    months from 1-12                     var day             dateObj getUTCDate                        var year            dateObj getUTCFullYear                          var newdate         year         month         day                      var entered birthdate            document getElementById  birth dates   value                      var birthdate                    new Date entered birthdate                       var birth year                   birthdate getUTCFullYear                        var birth month                  birthdate getUTCMonth     1                      var birth date                   birthdate getUTCDate                        var age year                      year-birth year                       var age month                     month-birth month                       var age date                       day-birth date   lt  0   31  day-birth date    day-birth date                       var test                          birth year gt year  true   age year   0    month lt birth month  true   month   birth month   day  lt  birth date  false   false                       if  test     true     document getElementById  birth dates   value                                  document getElementById  ages   innerHTML                                                else                          var age                           age year  gt  1  age year       age year    1   amp  amp  age month  gt   0   age year   age month  lt  0   age month 12    age month  gt  1  age month            age month   1   amp  amp   day gt birth date      age month age date                                             var ages                           age   age date  amp  amp  age   age month  amp  amp  age   age year    age date  days       age   age month 12    age   age month  amp  amp  age   age year    age  months   age year  years                             document getElementById  ages   innerHTML   ages                                         30

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Adopting from naveen s and original OP s posts I ended up with a reusable method stub that accepts both strings and   or JS Date objects   I named it gregorianAge   because this calculation gives exactly how we denote age using Gregorian calendar  i e  Not counting the end year if month and day is before the month and day of the birth year    x000D   x000D      x000D     Calculates human age in years given a birth day  Optionally ageAtDate x000D     can be provided to calculate age at a specific date x000D     x000D      param string Date Object birthDate x000D      param string Date Object ageAtDate optional x000D      returns integer Age between birthday and a given date or today x000D      x000D  function gregorianAge birthDate  ageAtDate    x000D       convert birthDate to date object if already not x000D    if  Object prototype toString call birthDate        object Date    x000D      birthDate   new Date birthDate   x000D   x000D       use today s date if ageAtDate is not provided x000D    if  typeof ageAtDate     undefined   x000D      ageAtDate   new Date    x000D   x000D       convert ageAtDate to date object if already not x000D    else if  Object prototype toString call ageAtDate        object Date    x000D      ageAtDate   new Date ageAtDate   x000D   x000D       if conversion to date object fails return null x000D    if  ageAtDate    null    birthDate    null  x000D      return null  x000D   x000D   x000D    var  m   ageAtDate getMonth   - birthDate getMonth    x000D   x000D       answer  ageAt year minus birth year less one  1  if month and day of x000D       ageAt year is before month and day of birth year x000D    return  ageAtDate getFullYear    - birthDate getFullYear    x000D    -    m  lt  0      m     0  amp  amp  ageAtDate getDate    lt  birthDate getDate       1   0  x000D    x000D   x000D     Below is for the attached snippet x000D   x000D  function showAge     x000D        age   text gregorianAge     dob   val     x000D    x000D   x000D    function     x000D        datepicker   datepicker    x000D    showAge    x000D      x000D   lt link rel  stylesheet  href    code jquery com ui 1 11 4 themes smoothness jquery-ui css  gt  x000D   lt script src    code jquery com jquery-1 10 2 js  gt  lt  script gt  x000D   lt script src    code jquery com ui 1 11 4 jquery-ui js  gt  lt  script gt  x000D   x000D  DOB  x000D   lt input name  dob  value  12 31 1970  id  dob  class  datepicker  onChange  showAge      gt  AGE   lt span id  age  gt  lt span gt  x000D   x000D   x000D

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I ve did some updated to one previous answer   var calculateAge   function dob        var days   function date                return 31 date getMonth     date getDate                       d   new Date dob 1000           now   new Date         return now getFullYear   - d getFullYear   -   measureDays now   lt  measureDays d        I hope that helps  D

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I believe that sometimes the readability is more important in this case  Unless we are validating 1000s of fields  this should be accurate and fast enough   x000D   x000D  function is18orOlder dateString      const dob   new Date dateString     const dobPlus18   new Date dob getFullYear     18  dob getMonth    dob getDate          return dobPlus18  valueOf    lt   Date now          Testing  console log is18orOlder  01 01 1910        true console log is18orOlder  01 01 2050        false     When I m posting this on 10 02 2020  so  console log is18orOlder  10 08 2002        true console log is18orOlder  10 19 2002        false x000D   x000D   x000D   I like this approach instead of using a constant for how many ms are in a year  and later messing with the leap years  etc  Just letting the built-in Date to do the job  Update  posting this snippet since one may found it useful  Since I m enforcing a mask on the input field  to have the format of mm dd yyyy and already validating if the date is valid  in my case  this works too to validate 18  years   function is18orOlder dateString       const  month  date  year    value split          return new Date  year   13   month   date  valueOf    lt   Date now

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function getAge dateString         var dates   dateString split  -        var d   new Date         var userday   dates 0       var usermonth   dates 1       var useryear   dates 2        var curday   d getDate        var curmonth   d getMonth   1      var curyear   d getFullYear         var age   curyear - useryear       if  curmonth  lt  usermonth        curmonth    usermonth   amp  amp  curday  lt  userday                age--              return age      To get the age when european date has entered   getAge  16-03-1989

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birthday   change function       var val this value   var current year new Date   getFullYear    if val  null       var Split   val split  -        var birth year parseInt Split 2         if parseInt current year -parseInt birth year  lt parseInt 18           maritial status   attr  disabled    disabled            var val2  document getElementById  maritial status            val2 value    Not Married               anniversary   attr  disabled    disabled            var val1  document getElementById  anniversary            val1 value    NA         else              maritial status   attr  disabled   false               anniversary   attr  disabled   false

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Here s my solution  just pass in a parseable date   function getAge birth      ageMS   Date parse Date    - Date parse birth     age   new Date      age setTime ageMS     ageYear   age getFullYear   - 1970     return ageYear        ageMonth   age getMonth       Accurate calculation of the month part of the age      ageDay   age getDate          Approximate calculation of the day part of the age

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Yet another solution          Calculate age by birth date         param int birthYear Year as YYYY      param int birthMonth Month as number from 1 to 12      param int birthDay Day as number from 1 to 31      return int     function getAge birthYear  birthMonth  birthDay      var today   new Date      var birthDate   new Date birthYear  birthMonth-1  birthDay     var age   today getFullYear   - birthDate getFullYear      var m   today getMonth   - birthDate getMonth      if  m  lt  0     m     0  amp  amp  today getDate    lt  birthDate getDate           age--        return age

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This is my modification      function calculate age date         var today   new Date         var today month   today getMonth     1    STRANGE NUMBERING   January is 0       var age   today getYear   - date getYear          if   today month  gt  date getMonth        today month    date getMonth     amp  amp   today getDate    lt  date getDate                age--              return age

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Try this   function getAge dateString        var today   new Date        var birthDate   new Date dateString       var age   today getFullYear   - birthDate getFullYear        var m   today getMonth   - birthDate getMonth        if  m  lt  0     m     0  amp  amp  today getDate    lt  birthDate getDate               age--            return age      I believe the only thing that looked crude on your code was the substr part   Fiddle  http   jsfiddle net codeandcloud n33RJ

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see this example you get full year month day information from here   function getAge dateString        var today   new Date        var birthDate   new Date dateString       var age   today getFullYear   - birthDate getFullYear        var m   today getMonth   - birthDate getMonth        var da   today getDate   - birthDate getDate        if  m  lt  0     m     0  amp  amp  today getDate    lt  birthDate getDate               age--            if m lt 0           m   12            if da lt 0           da   30            return age   years    Math abs m     months   Math abs da      days     alert  age      getAge  1987 08 31          http   jsfiddle net tapos00 2g70ue5y   1

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This is my amended attempt  with a string passed in to function instead of a date object    function calculateAge dobString        var dob   new Date dobString       var currentDate   new Date        var currentYear   currentDate getFullYear        var birthdayThisYear   new Date currentYear  dob getMonth    dob getDate         var age   currentYear - dob getFullYear         if birthdayThisYear  gt  currentDate            age--             return age      And usage   console log calculateAge  1980-01-01

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I just had to write this function for myself - the accepted answer is fairly good but IMO could use some cleanup  This takes a unix timestamp for dob because that was my requirement but could be quickly adapted to use a string    var getAge   function dob        var measureDays   function dateObj                return 31 dateObj getMonth   dateObj getDate                       d   new Date dob 1000           now   new Date         return now getFullYear   - d getFullYear   -  measureDays now   lt  measureDays d        Notice I ve used a flat value of 31 in my measureDays function   All the calculation cares about is that the  day-of-year  be a monotonically increasing measure of the timestamp   If using a javascript timestamp or string  obviously you ll want to remove the factor of 1000

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Try this       Datepicker   change function     var  bef       Datepicker   val    var  today   new Date    var  before   new Date  bef   var  befores    before getFullYear    var  todays    today getFullYear    var  bmonth    before getMonth    var  tmonth    today getMonth    var  bday    before getDate    var  tday    today getDate     if   bmonth gt  tmonth       age   val  todays- befores     if   bmonth   tmonth       if   tday  gt   bday       age   val  todays- befores-1    else if   tday  lt    bday       age   val  todays- befores      else if   bmonth lt  tmonth        age   val  todays- befores-1

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I am a bit too late but I found this to be the simplest way to calculate a birth date  Hopefully this will help   x000D   x000D  function init       writeYears  myage   0  Age         function Age       var birthday   new Date 1997  02  01     Year  month-1   day      today   new Date        one year   1000   60   60   24   365    return Math floor  today getTime   - birthday getTime      one year      function writeYears id  current  maximum      document getElementById id  innerHTML   current     if  current  lt  maximum        setTimeout function           writeYears id    current  maximum          Math sin current   maximum    200         init   x000D   lt span id  myage  gt  lt  span gt  x000D   x000D   x000D

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All the answers I tested here  about half  think 2000-02-29 to 2001-02-28 is zero years  when it most likely should be 1 since 2000-02-29 to 2001-03-01 is 1 year and 1 day  Here is a getYearDiff function that fixes that  It only works where d0  lt  d1   function getYearDiff d0  d1         d1   d1    new Date         var m   d0 getMonth        var years   d1 getFullYear   - d0 getFullYear         d0 setFullYear d0 getFullYear     years        if  d0 getMonth      m  d0 setDate 0        return d0  gt  d1  --years   years

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Get the age  years  months and days  from the date of birth with javascript  Function calcularEdad  years  months and days   function calcularEdad fecha               Si la fecha es correcta  calculamos la edad          if  typeof fecha     string   amp  amp  fecha  amp  amp  esNumero fecha getTime                   fecha   formatDate fecha   yyyy-MM-dd                       var values   fecha split  -            var dia   values 2           var mes   values 1           var ano   values 0               cogemos los valores actuales         var fecha hoy   new Date            var ahora ano   fecha hoy getYear            var ahora mes   fecha hoy getMonth     1          var ahora dia   fecha hoy getDate                realizamos el calculo         var edad    ahora ano   1900  - ano          if  ahora mes  lt  mes                edad--                    if   mes    ahora mes   amp  amp   ahora dia  lt  dia                 edad--                    if  edad  gt  1900                edad -  1900                        calculamos los meses         var meses   0           if  ahora mes  gt  mes  amp  amp  dia  gt  ahora dia              meses   ahora mes - mes - 1          else if  ahora mes  gt  mes              meses   ahora mes - mes         if  ahora mes  lt  mes  amp  amp  dia  lt  ahora dia              meses   12 -  mes - ahora mes           else if  ahora mes  lt  mes              meses   12 -  mes - ahora mes   1           if  ahora mes    mes  amp  amp  dia  gt  ahora dia              meses   11              calculamos los dias         var dias   0          if  ahora dia  gt  dia              dias   ahora dia - dia          if  ahora dia  lt  dia                ultimoDiaMes   new Date ahora ano  ahora mes - 1  0               dias   ultimoDiaMes getDate   -  dia - ahora dia                      return edad     a  os      meses     meses y     dias     d  as           Function esNumero  function esNumero strNumber        if  strNumber    null  return false      if  strNumber    undefined  return false      if  typeof strNumber      number   amp  amp   isNaN strNumber   return true      if  strNumber        return false      if  strNumber         return false      var psInt  psFloat      psInt   parseInt strNumber       psFloat   parseFloat strNumber       return  isNaN strNumber   amp  amp   isNaN psFloat

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You may use this for age restriction in your form -  function dobvalidator birthDateString       strs   birthDateString split  -        var dd   strs 0       var mm   strs 1       var yy   strs 2        var d   new Date        var ds   d getDate        var ms   d getMonth        var ys   d getFullYear        var accepted age   18       var days     accepted age   12    30     ms   30    ds      var age      ys - yy    12    30      12 - mm    30    parseInt 30 - dd        if  days - age   lt    0            console log  days - age            alert  You are at-least     accepted age        else          console log  days - age            alert  You are not at-least     accepted age

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I ve checked the examples showed before and they didn t worked in all cases  and because of this i made a script of my own  I tested this  and it works perfectly   function getAge birth       var today   new Date       var curr date   today getDate       var curr month   today getMonth     1     var curr year   today getFullYear        var pieces   birth split          var birth date   pieces 0      var birth month   pieces 1      var birth year   pieces 2       if  curr month    birth month  amp  amp  curr date  gt   birth date  return parseInt curr year-birth year      if  curr month    birth month  amp  amp  curr date  lt  birth date  return parseInt curr year-birth year-1      if  curr month  gt  birth month  return parseInt curr year-birth year      if  curr month  lt  birth month  return parseInt curr year-birth year-1      var age   getAge  18 01 2011    alert age

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To test whether the birthday already passed or not  I define a helper function Date prototype getDoY  which effectively returns the day number of the year  The rest is pretty self-explanatory   Date prototype getDoY   function         var onejan   new Date this getFullYear    0  1       return Math floor   this - onejan    86400000    1       function getAge birthDate        function isLeap year            return year   4    0  amp  amp   year   100    0    year   400    0              var now   new Date            age   now getFullYear   - birthDate getFullYear            doyNow   now getDoY            doyBirth   birthDate getDoY            normalize day-of-year in leap years     if  isLeap now getFullYear     amp  amp  doyNow  gt  58  amp  amp  doyBirth  gt  59          doyNow--       if  isLeap birthDate getFullYear     amp  amp  doyNow  gt  58  amp  amp  doyBirth  gt  59          doyBirth--       if  doyNow  lt   doyBirth          age--      birthday not yet passed this year  so -1      return age      var myBirth   new Date 2001  6  4   console log getAge myBirth

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Important  This answer doesn t provide an 100  accurate answer  it is off by around 10-20 hours depending on the date       There are no better solutions   not in these answers anyway    - naveen   I of course couldn t resist the urge to take up the challenge and make a faster and shorter birthday calculator than the current accepted solution  The main point for my solution  is that math is fast  so instead of using branching  and the date model javascript provides to calculate a solution we use the wonderful math  The answer looks like this  and runs  65  faster than naveen s plus it s much shorter   function calcAge dateString      var birthday    new Date dateString     return     Date now   - birthday     31557600000        The magic number  31557600000 is 24   3600   365 25   1000 Which is the length of a year  the length of a year is 365 days and 6 hours which is 0 25 day  In the end i floor the result which gives us the final age   Here is the benchmarks  http   jsperf com birthday-calculation  To support OP s data format you can replace  new Date dateString     with  new Date d substr 0  4   d substr 4  2 -1  d substr 6  2     If you can come up with a better solution please share   -

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With momentjs  fromNow  method   This allows you to work with formatted date  ie  03 15 1968  var dob   document getElementByID  dob    var age   moment dob value  fromNow true  replace   years            fromNow true    gt  suffix  ago  is not displayed   but we still have to get rid of  years     As a prototype version  String prototype getAge   function     return moment this valueOf    fromNow true  replace   years

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Two more options      Int Age to Date as string YYY-mm-dd function age to date age        try           var d   new Date            var new d               d setFullYear d getFullYear   - Math abs age            new d   d getFullYear      -    d getMonth      -    d getDate             return new d        catch err            console log err message              Date string  YYY-mm-dd  to Int age  years old  function date to age date        try           var today   new Date            var d   new Date date            var year   today getFullYear   - d getFullYear            var month   today getMonth   - d getMonth            var day   today getDate   - d getDate            var carry   0           if  year  lt  0              return 0          if  month  lt   0  amp  amp  day  lt   0              carry -  1           var age   parseInt year           age    carry           return Math abs age         catch err            console log err message

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I have a pretty answer although it s not my code  Unfortunately I forgot the original post    function calculateAge y  m  d        var  birth   parseInt      y   affixZero m    affixZero d        var  today   new Date        var  today   parseInt      today getFullYear     affixZero today getMonth     1    affixZero today getDate          return parseInt   today -  birth    10000     function affixZero int        if  int  lt  10  int    0    int      return      int    var age   calculateAge 1980  4  22   alert age

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I think that could be simply like that   function age dateString       let birth   new Date dateString       let now   new Date        let beforeBirth          gt   birth setDate now getDate    birth setMonth now getMonth     return birth getTime        lt  birth getTime      0   1      return now getFullYear   - birth getFullYear   - beforeBirth     age  09 20 1981      35   Works also with a timestamp  age 403501000000    34

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here is a simple way of calculating age      dob date dd mm yy  var d   01 01 1990     today   date today string format  var today   new Date       i e wed 04 may 2016 15 12 09 GMT   todays year var todayYear   today getFullYear       today month var todayMonth   today getMonth      today date var todayDate   today getDate       dob   dob parsed as date format    var dob   new Date d      dob year var dobYear   dob getFullYear       dob month var dobMonth   dob getMonth      dob date var dobDate   dob getDate     var yearsDiff   todayYear - dobYear   var age   if   todayMonth  lt  dobMonth          age   yearsDiff - 1      else if   todayMonth  gt  dobMonth         age   yearsDiff        else   if today month   dob month    if   todayDate  lt  dobDate           age   yearsDiff - 1          else             age   yearsDiff

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Here s the simplest  most accurate solution I could come up with   Date prototype getAge   function  date        if   date  date   new Date        return     date getFullYear     date getMonth     100       date getDate     10000  -  this getFullYear          this getMonth     100   this getDate     10000        And here is a sample that will consider Feb 29 -  Feb 28 a year   Date prototype getAge   function  date        if   date  date   new Date        var feb    date getMonth      1    this getMonth      1       return     date getFullYear     date getMonth     100             feb  amp  amp  date getDate      29   28   date getDate              10000  -  this getFullYear     this getMonth     100             feb  amp  amp  this getDate      29   28   this getDate               10000        It even works with negative age

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I know this is a very old thread but I wanted to put in this implementation that I wrote for finding the age which I believe is much more accurate    var getAge   function year month date       var today   new Date        var dob   new Date        dob setFullYear year       dob setMonth month-1       dob setDate date       var timeDiff   today valueOf   - dob valueOf        var milliInDay   24 60 60 1000      var noOfDays   timeDiff   milliInDay      var daysInYear   365 242      return    noOfDays   daysInYear         Ofcourse you could adapt this to fit in other formats of getting the parameters  Hope this helps someone looking for a better solution

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function age         var birthdate    j   birthDate   val       in    mm dd yyyy  format     var senddate    j   expireDate   val       in    mm dd yyyy  format     var x   birthdate split               var y   senddate split           var bdays   x 1       var bmonths   x 0       var byear   x 2         alert bdays       var sdays   y 1       var smonths   y 0       var syear   y 2         alert sdays        if sdays  lt  bdays                sdays   parseInt sdays    30          smonths   parseInt smonths  - 1            alert sdays           var fdays   sdays - bdays            alert fdays             else          var fdays   sdays - bdays             if smonths  lt  bmonths                smonths   parseInt smonths    12          syear   syear - 1          var fmonths   smonths - bmonths            else               var fmonths   smonths - bmonths             var fyear   syear - byear      document getElementById  patientAge   value   fyear   years   fmonths   months   fdays   days

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One more possible solution with moment js   var moment   require  moment    var startDate   new Date    var endDate   new Date    endDate setDate endDate getFullYear     5      Add 5 years to second date console log moment duration endDate - startDate  years        This should returns 5

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var now   DateTime Now  var age   DateTime Now Year - dob Year  if  now Month  lt  dob Month    now Month    dob Month  amp  amp  now Day  lt  dob Day  age--

[javascript] Calculate age given the birth date in the format YYYYMMDD

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