Another thread, "Developing Spin Endurance", brought a general response that we may look like duffers but don't have to ride like 'em. In Joe Friel's book, "Cycling Past 50", he suggests that naturally declining performance with age can best be battled with intensity work--not just long, slow distance alone.
Question: How many of us never say die duffer types are including hill-repeats, intervals, racing for the city limit sign, pushing into the discomfort zone in a planned way, etc....IOW, purposefully hanging our toes on the edge of blowing up.
This has nothing to do with denying aging, pretending to be young, etc. Just being our best whatever that is, or can be, for us each.