Get age by date of birth (JavaScript)

age.js

/**
* Returns age from date of birth
*
* @param {Date} date
* @returns {Number}
*/
function getAge(date) {
    var now = new Date();
    var age = now.getFullYear() - date.getFullYear();
    return age;
};

demo.js

// iso date time
var dateOfBirth = new Date('1982-03-28 00:00:00');

// calculate age
var age = getAge(dateOfBirth);

// output
console.log(age);