Well I'm 50, and I feel 40 years my senior. Because I've been in one very major motorcycle accident (head on with a car, ran over by said car), and two lesser. Had a line over while parachuting and hit the ground at 50mph, was blown up with a grenade simulator, crashed a bicycle in a race at 55mph, blew out my knee for the second time in a volleyball tournament, separated my shoulder lifting a guy from a car hanging off a cliff, blew out my other knee when a 400lb patient was dropped on me and hyper-flexed it, been knocked unconscious boxing and in football, blew out my knee the 3rd time when a 160lb St. Bernard decided to give me some love, broke my ribs at least 4 times (always the same ones too). Only drink the occasional beer, never smoked, don't take drugs. But my body has been through hell and it all hurts.