If this sounds like bragging--well it is. I'll be 62 this summer and I weigh less now than I did when I was 18. Since I retired I've managed to stay in shape by riding my bicycle, canoeing, kayaking and when I have time, I take some nice long walks.
I don't run much any more, because it is kind of hard on the joints, but if I had to, I think I could still rip off a mile or two.
I've just about given up on gunshows, but if I'd known that was what caused one to get out of shape, I would have quit even sooner.