I'm just curious. I'm 46 and, fortunately, can still go a good distance every day at a good pace. I hooked up with a guy this morning that looked to be quite a bit older than me in full biking gear on an older Klein road bike. The two of us were moving out pretty good. I got to thinking about it as I was going along. I often wonder how long a person can expect to keep going? I know there are a lot of factors to consider here. I'm an IT guy and I have some friends out west in Silicon Valley who do a commute every day that amounts to about 40+ miles one way. I've always wanted to someday (hopefully soon) move back out there (SF) and do this commute myself. Most of the people doing it are quite a bit younger than me. Pipe dream? I dunno... I'd be interested in knowing the age range of some of you and how far you go? Particularly interested in some of the big distance people...