Sitting in an airport lounge recently, I watched an advertisement for the latest Terminator movie – it will be the fifth big-screen version of the basic killer-robot-from-the-future story -- and I was struck by a realization. The new film, Terminator Genisys features a new and younger cast of characters. But it also features a lengthy appearance from the original Terminator robot himself, Arnold Schwarzenegger, who will be 68 years old at the end of this month.