moment.js还有一个可能的解决方案:

var moment = require('moment');
var startDate = new Date();
var endDate = new Date();
endDate.setDate(endDate.getFullYear() + 5); // Add 5 years to second date
console.log(moment.duration(endDate - startDate).years()); // This should returns 5

从日期选择器计算年龄

         $('#ContentPlaceHolder1_dob').on('changeDate', function (ev) {
            $(this).datepicker('hide');

            //alert($(this).val());
            var date = formatDate($(this).val()); // ('2010/01/18') to ("1990/4/16"))
            var age = getAge(date);

            $("#ContentPlaceHolder1_age").val(age);
        });


    function formatDate(input) {
        var datePart = input.match(/\d+/g),
        year = datePart[0], // get only two digits
        month = datePart[1], day = datePart[2];
        return day + '/' + month + '/' + year;
    }

    // alert(formatDate('2010/01/18'));


    function getAge(dateString) {
        var today = new Date();
        var birthDate = new Date(dateString);
        var age = today.getFullYear() - birthDate.getFullYear();
        var m = today.getMonth() - birthDate.getMonth();
        if (m < 0 || (m === 0 && today.getDate() < birthDate.getDate())) {
            age--;
        }
        return age;
    }

function getAge(dateString) {

    var dates = dateString.split("-");
    var d = new Date();

    var userday = dates[0];
    var usermonth = dates[1];
    var useryear = dates[2];

    var curday = d.getDate();
    var curmonth = d.getMonth()+1;
    var curyear = d.getFullYear();

    var age = curyear - useryear;

    if((curmonth < usermonth) || ( (curmonth == usermonth) && curday < userday   )){

        age--;

    }

    return age;
}

获取欧洲日期输入时的年龄:

getAge('16-03-1989')

使用javascript从出生日期获取年龄(年，月和日)

函数calcularEdad(年，月和日)

function calcularEdad(fecha) {
        // Si la fecha es correcta, calculamos la edad

        if (typeof fecha != "string" && fecha && esNumero(fecha.getTime())) {
            fecha = formatDate(fecha, "yyyy-MM-dd");
        }

        var values = fecha.split("-");
        var dia = values[2];
        var mes = values[1];
        var ano = values[0];

        // cogemos los valores actuales
        var fecha_hoy = new Date();
        var ahora_ano = fecha_hoy.getYear();
        var ahora_mes = fecha_hoy.getMonth() + 1;
        var ahora_dia = fecha_hoy.getDate();

        // realizamos el calculo
        var edad = (ahora_ano + 1900) - ano;
        if (ahora_mes < mes) {
            edad--;
        }
        if ((mes == ahora_mes) && (ahora_dia < dia)) {
            edad--;
        }
        if (edad > 1900) {
            edad -= 1900;
        }

        // calculamos los meses
        var meses = 0;

        if (ahora_mes > mes && dia > ahora_dia)
            meses = ahora_mes - mes - 1;
        else if (ahora_mes > mes)
            meses = ahora_mes - mes
        if (ahora_mes < mes && dia < ahora_dia)
            meses = 12 - (mes - ahora_mes);
        else if (ahora_mes < mes)
            meses = 12 - (mes - ahora_mes + 1);
        if (ahora_mes == mes && dia > ahora_dia)
            meses = 11;

        // calculamos los dias
        var dias = 0;
        if (ahora_dia > dia)
            dias = ahora_dia - dia;
        if (ahora_dia < dia) {
            ultimoDiaMes = new Date(ahora_ano, ahora_mes - 1, 0);
            dias = ultimoDiaMes.getDate() - (dia - ahora_dia);
        }

        return edad + " años, " + meses + " meses y " + dias + " días";
    }

函数esNumero

function esNumero(strNumber) {
    if (strNumber == null) return false;
    if (strNumber == undefined) return false;
    if (typeof strNumber === "number" && !isNaN(strNumber)) return true;
    if (strNumber == "") return false;
    if (strNumber === "") return false;
    var psInt, psFloat;
    psInt = parseInt(strNumber);
    psFloat = parseFloat(strNumber);
    return !isNaN(strNumber) && !isNaN(psFloat);
}

看这个例子，你从这里得到完整的年、月、日信息

function getAge(dateString) {
    var today = new Date();
    var birthDate = new Date(dateString);
    var age = today.getFullYear() - birthDate.getFullYear();
    var m = today.getMonth() - birthDate.getMonth();
    var da = today.getDate() - birthDate.getDate();
    if (m < 0 || (m === 0 && today.getDate() < birthDate.getDate())) {
        age--;
    }
    if(m<0){
        m +=12;
    }
    if(da<0){
        da +=30;
    }
    return age+" years "+ Math.abs(m) + "months"+ Math.abs(da) + " days";
}
alert('age: ' + getAge("1987/08/31"));    
[http://jsfiddle.net/tapos00/2g70ue5y/][1]

从naveen和原始OP的帖子中采用，我最终得到了一个可重用的方法存根，它接受字符串和/或JS Date对象。

我将其命名为gregorianAge()，因为这个计算准确地给出了我们如何使用公历表示年龄。即，如果月和日在出生年份的月和日之前，则不计算结束年。

/** * Calculates human age in years given a birth day. Optionally ageAtDate * can be provided to calculate age at a specific date * * @param string|Date Object birthDate * @param string|Date Object ageAtDate optional * @returns integer Age between birthday and a given date or today */ function gregorianAge(birthDate, ageAtDate) { // convert birthDate to date object if already not if (Object.prototype.toString.call(birthDate) !== '[object Date]') birthDate = new Date(birthDate); // use today's date if ageAtDate is not provided if (typeof ageAtDate == "undefined") ageAtDate = new Date(); // convert ageAtDate to date object if already not else if (Object.prototype.toString.call(ageAtDate) !== '[object Date]') ageAtDate = new Date(ageAtDate); // if conversion to date object fails return null if (ageAtDate == null || birthDate == null) return null; var _m = ageAtDate.getMonth() - birthDate.getMonth(); // answer: ageAt year minus birth year less one (1) if month and day of // ageAt year is before month and day of birth year return (ageAtDate.getFullYear()) - birthDate.getFullYear() - ((_m < 0 || (_m === 0 && ageAtDate.getDate() < birthDate.getDate())) ? 1 : 0) } // Below is for the attached snippet function showAge() { $('#age').text(gregorianAge($('#dob').val())) } $(function() { $(".datepicker").datepicker(); showAge(); }); <link rel="stylesheet" href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css"> <script src="//code.jquery.com/jquery-1.10.2.js"></script> <script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script> DOB: <input name="dob" value="12/31/1970" id="dob" class="datepicker" onChange="showAge()" /> AGE: <span id="age"><span>