I have a cycling friend that was an elite cyclist and just turned 80. He’s slowed quite a bit from his elite years but is still able to comfortably ride his age. It will be interesting to see how long he’s able to sustain the Birthday ride as he matures.
I’m at least a notch or two below his abilities but at 65 I can still ride 200 milers. I’m thinking that if I can still ride my age into my early 80’s that’s pretty dog gone good. It really does help if you have a good group of others riding with you with the goal of the ride focused on helping the elder rider complete the miles.