At 65, the number of randonneurs older than me is shrinking; there's one outlier in our club over 80. We all hope we'll be that guy. I'm just going to focus on enjoying every ride.
Fun thing on the 80 y/o. We had a 100k this summer with an out and back segment halfway. I was on the return and here he came still outbound. Something looked funny as he approached, and as he went by i saw he had no left crankarm - left leg hanging. I looked back and he just kept riding away. Weird. Days later I got the story. His left crankarm came off in the first half, and he finished the ride on one leg. Yeah, we all want to grow up to be that guy.