I'm into my early 40's and plan to keep riding for the rest of my life which is something I never gave much thought to when I was in my 20's living more "in the moment". I'm also happy to say that I'm a better rider now, I accomplish more now than I ever did, and my goals are always increasing.
The only cyclists I know from where I work are two guys in their late 50's. We chat about rides, compare notes, etc., and every now and then we'll meet up and take a short ride together. Those guys serve as great role models to me for the direction I want to head in as I grow older, and I guess I can say the same for everyone here as well.