A touring buddy of mine is 66. I am 54. He can easily kick my butt in the saddle (and out of it too, he is like 5'7" and all muscle). I am in the best shape of my life. While my buddy is in much better shape, I can still do things now that I could not do 20 years ago. Granted that 20 years ago had I started to get myself in shape it would have happened a lot quicker but I didn't.
Several years ago I was inspired by an old man sailing a Laser. It was off of Antigua. I don't know if you ever sailed a Laser before but it is not an easy feat. I looked at him and said I wanted to be that guy when I get older, I want some young punk saying "hey look at the old guy", referring to me on a Laser.