59 this year and still exercising 6/7 times a week, but a mix of biking, running, swimming and circuits. And I windsurf whenever it’s windy and warm enough. Slightly dodgy lower back from too many years of rowing, and a mild heart arrhythmia controlled by drugs, and I’ve definitely slowed down a bit since 55. But I’ve finally given up being super competitive after 40 years of all sorts of racing, which required a bit of brain re-wiring and I now just do stuff for fun. Still hold a number of local off road KOMs though 😀