Calculate age from birth date

Question

I cant find age in from birth date. What I got is

fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb) 

My code

Answer 1

Just use the DateTools pod. Absolutely the easiest way. https://github.com/MatthewYork/DateTools

For Swift 3

import DateTools

let birthday: Date = ....
let ageString = String((Date() as NSDate).years(from: birthday))