Yeah, I used to think that when I was in my 40's. About 16 yrs ago my kid was playing Pop Warner football. The coaches put together a flag football game at a local indoor sports club between the coaches and the dad's. It was very fun. However, the first play of the game one dad "exploded" out of his stance and blew out his Achilles. A few plays later another dad popped his hammy. I thought I survived the night. However, when I got home, after about a 15 min car ride, I couldn't get out of my truck, my one knee felt like it fell off. It ended up that I tore a meniscus. Had surgery a few months later.
We were all in our early to mid 40's and we were a mess. Sure, not former pro athletes, but I mean I played rec basketball into my 30's and was always very active. So age does catch up quick. I still wince everytime I see Stafford scrambling out of the pocket just hoping nothing pops.