In Swift, here is a class method extension to NSDate that calculates a person's age given their birthday in NSDate format:

extension NSDate {
   class func calculateAge(birthDate: NSDate) -> Int {
        
       var calendar = NSCalendar.currentCalendar()
       let ageComponents = calendar.components(.CalendarUnitYear, fromDate: birthDate, toDate: NSDate(), options: nil)
      return ageComponents.year
   }
}

You use it like this:

let age = NSDate.calculateAge(<pass the NSDate>)

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