I'm past 60 and I suffer from the aches, pains, CRS, & all the usual limitations. I do my best to stay in good shape and by and large I've succeeded , within the limits of back and knee problems.
My office is a shark tank of 30ish, Type A professionals, who like to tease the old guy. I keep a $100 bill in my wallet. When the age issue arises, I put it on the desk and say, " My $100 says I can do more push-ups than you, right now!" So far, no takers. So I really don't know yet whether or not my mouth wrote a check my butt can't cash?