55m here.
Was an avid volleyball player, even though I'm 5'8" (1.72m) tall. I have very strong legs and could meet a lot of 6'2" plus guys at the top of the net.
Skydiver with 4500 jumps, spent a few years doing it professionally.
Now, my knees and back are shot. I can still play volleyball, but my jumps are about half what they used to be and I need to wear knee braces. Skydiving is almost completely out, unless I jump a very soft opening canopy as I have a disk bulge that is pressing on a sciatic nerve. If I get slammed on opening that could present a LOT of issues for me.
Now I focus on those things that I can do. I've always been an avid hiker and there is a nice state park nearby. I try to hike the trails there every day. Also I keep up with working out. Weights and other exercises. I'm not trying to build muscle, just keep what I have.
Right now, I'm sitting here with a very sore back and aching muscles, due to helping out my wife's Figure Skating Club to setup for a competition this weekend. That involved moving a lot of tables, chairs, podiums and other things for 4 hours last night.
I think I'm going to take it easy today.