Ninety-year-old John Carter doesn't let his age stop him from living an active lifestyle. By active, we don't mean he goes for a jog every morning. No, John bikes, lifts weights, plays sports and does backflips off of diving boards... He's the real deal, and he's not stopping any time soon! John is real-life proof that age is but a number, and you can be a stellar athlete at any stage of life.