<script type="text/javascript">
// Calculate age
$(document).ready( function(){
$('[name=dob]').change(function(){
var myDob = $('[name=dob]').val();
var myYob = parseInt(myDob.slice(-4));
var myCY = parseInt('#date.yyyy#');
var myAge = '';
if (myYob !== '' && myYob < myCY) {
myAge = myCY - myYob;
$('[name=age]').val(myAge);
} else {
$('[name=age]').val('0');
}
});
});
</script>