What Lisa S.H. and Mimi said.

We have a friend who only recently stopped doing triathlons at 74. She just oozes positive energy! I've told her I want to be her when I grow up. I'm "only" 54 now, so there's time. I have no plans for a tri, but hope to continue cycling as long as I possibly can. I only came back to it four years ago after an almost 30 year lull. I'm fitter now than I ever was in my 20s when I was thin simply because I was young and didn't eat much.