you would need to edit the date picker code, and add a yearRange argument:
the code for the DOB element is:
$(function(){
$('#DOB').datepicker({
changeMonth: true,
changeYear: true,
dateFormat: 'dd-mm-yy',
showAnim: 'show',
onClose: closeDatePicker_DOB
});
});
change that to:
$(function(){
$('#DOB').datepicker({
changeMonth: true,
changeYear: true,
yearRange: '1950:2013',
dateFormat: 'dd-mm-yy',
showAnim: 'show',
onClose: closeDatePicker_DOB
});
});