If you look down the demo page a bit, you’ll see a “Restricting Datepicker” section. Use the dropdown to specify the “Year dropdown shows last 20 years” demo , and hit view source:
$("#restricting").datepicker({
yearRange: "-20:+0", // this is the option you're looking for
showOn: "both",
buttonImage: "templates/images/calendar.gif",
buttonImageOnly: true
});
You’ll want to do the same (obviously changing -20 to -100 or something).
Or you can use
$('#dp1').datepicker({
format: 'mm-dd-yyyy',
startDate: '-15d',
endDate: '+0d' // there's no convenient "right now" notation yet
});
solved Datepicker validation 18 years of age [closed]