Calculate age using datepicker

$( function() {

    $( "#datepicker").datepicker({dateFormat: 'mm/dd/yyyy'});

  } );

$("#datepicker").datepicker({

        maxDate: '+0d',    

        yearRange: '1914:3025',

        buttonImageOnly: true,

        changeMonth: true,

        changeYear: true,

      

    }).on('change', function () {

        var age = getAge(this);

        $("#age").html("You are " + age + " old");

      

    });

    function getAge(dateVal) {

        var

            birthday = new Date(dateVal.value),

            today = new Date(),

            ageInMilliseconds = new Date(today - birthday),

            years = ageInMilliseconds / (24 * 60 * 60 * 1000 * 365.25 ),

            months = 12 * (years % 1),

            days = Math.floor(30 * (months % 1));

            return Math.floor(years) + ' years ' + Math.floor(months) + ' months ' + days + ' days';

    }