Well, I can still do the splits. But I'm not showing that off any more because it never comes up in conversation.
I wasn't agile after I had heart surgery at age 46, but I didn't think of that. We were camping (in a cabin) at a state park, and I decided to go up a long, steep hill to get the cabin because it was both a challenge and a shortcut. Good thing my collie was witih me -- on my own, I would have been stranded mid-hill.
My former neighbor/now landlord, is still agile. He is 77, in excellent shape and health, and can climb high into a tree, like a monkey. He likes to give me a heart attack - but he uses safety equipment. He used to be a landscaper/tree surgeon. He is a pretty amazing guy - he can do everything I don't know how to do. Some of them things he did in the past - like raising sheep to old age (to stock his nursing home for aging sheep), since he never ate his animals).