I am experiencing this too. I am 70 and I cycle with groups and normally ride 100-150 miles per week. I also hike a bit and go to Pilates. I have degenerative discs in my spine and recently developed perineal tendonitis in my ankle, probably from too much Pilates ( lots of ankle strengthening work) which affects my ability to get out and do these activities. I find it very difficult to accept restrictions on how much I can do.I also have osteoporosis and arthritis…fun fun. I know it is better than the alternative and am grateful for what I can still do