We all know and perhaps some are those who are fresh and able 'til they're ninety. My next up bro is like that, 69 and rides bike 10,000 miles a year, travels with spouse all over the world constantly. But each of us has to deal with our own specific ailments and make our own decisions about what we do and what works for us.
I'm still thinking about a grand blowout before I bite the bullet like doing the ICW or something like that. But maybe I'll just stick with running a few hundred miles of the Columbia River and circumnavigating Puget Sound. Time will tell one way or another..
Photo is me about 35 years ago on the Napali Coast trail in 1980 while we were sailing in Hawaii.