At 72 I have learned to listen to what my body is telling me. Example is osteoarthritis tell me the days we are on a recumbent trike, I know that if I do 20+ every other day with a walk/rest day spacer I can handle a rest day 20+ ride with the kids/grandkids when they visit and they love it. Another example is higher bars, less time in the drops, lower cadence, etc. Remembering you are investing in a better future in all you do.