Using those standards, my 85 year old dad is more fun than some of my 50-something non-riding friends.
I really think there is a growing "generation gap" within the same generation, once you get into your forties. I look at people at the grocery store, around town, etc. and it's disturbing. Now, some of these people didn't care about their health when they were young, either, but once they age, the whole process just accelerates. My DH is bothered even more by the poor health habits he sees around him, mostly because at 53, he is able to continue to be an in-shape cyclist who rides 2-3k miles a year, with 2 stents, taking 5 medications a day. He just wishes he had started it all in his twenties, because it's all poor genetics.