Perfect for date of birth fields (and what I use) is similar to what Shog9 said, although I'm going to give a more specific DOB example:
$(".datePickerDOB").datepicker({
yearRange: "-122:-18", //18 years or older up to 122yo (oldest person ever, can be sensibly set to something much smaller in most cases)
maxDate: "-18Y", //Will only allow the selection of dates more than 18 years ago, useful if you need to restrict this
minDate: "-122Y"
});
Hope future googlers find this useful :).