As I approach my 74th birthday next week I am following this thread closely. As I age I find the real challenge is to do it gracefully. My mind still can live in a time when I could do things that my body tells me is a fantasy. When I think I would take a 7 mile run very early in the morning and then go to work and come home and deal with a young family, my body would say come back to the present. For me, and I know most here, there is something between full throttle and not getting off the couch. One big adjustment for me is not riding on the roads here in Southern New England. Drivers here are way too aggressive and distracted to coexist with on the roads. So I ride on bike paths that I find safer for me and can be visually more appealing. Riding a bike is always going to have some level of risk and with a body that is a bit more brittle falls can be brutal. The OP is dealing with this in a very admirable way and I wish you good luck in your recovery journey. Someone once said “Happiness is good health and a bad memory”. Works for me. Good luck getting better and thanks for sharing your experience with us.