Swift : How to calculate a person's age from their birth date in NSDate format

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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