How do I calculate age from birth date in Angular 2 using TypeScript

I have 2 textboxes. One textbox will accept birth date from the user and based on birth date I want to calculate and display their age in another textbox.

Here's my component class

Student.component.html

<div class="row">
<div class="input-field col m2">
<input type="date" id="txtdate">
</div>
<div class="input-field col m4">
<input type="number" id="age">
</div>



student.component.ts

import { Component, OnInit } from '@angular/core';

@Component( {
selector: 'stud',
templateUrl: './student.component.html'
})
export class StudentComponent implements OnInit
{

constructor() { }

ngOnInit() { }

}
function CalculateAge()
{
var birthdate = <HTMLElement>document.getElementById( "txtdate" );
var dt = new Date();
var today = dt.getDate();

}


How do I calculate age from birth date?

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