Get age from (Birth) Date object

Date+Age.swift

//
//  Date+Age.swift
//
//
//  Created by John Spiropoulos on 29/09/16.
//  Copyright © 2016 John Spiropoulos. All rights reserved.
//

/*
Swift 3 Helper extension:
usage example:
let myBirthday = Calendar.current.date(from: DateComponents(year: 1985, month: 7, day: 15))!
let myAge = myBirthday.age      // 31
*/

extension Date {
    var age: Int {
        return Calendar.current.dateComponents([.year], from: self, to: Date()).year!
    }
}