I am 55, live in northeast Ohio, and ride an 80's Schwinn World Sport. I have not gotten on a new bike because I don't want to know what I'm missing, but I'm damn happy with the World Sport. Been riding for about 5 years after a 25 year hiatus (why?!) and LOVE it. I try to get out on at least 2-3 rides a week of anywhere between 20 and 40 miles, some on road, some on bikepaths, and a ton of miscellaneous trips around town. I try to ride all year. No supplements at all. I play basketball twice a week and my biking helps me keep up with high school kids. I don't beleive I've slowed down much, though I do notice things the next day that I didn't used to.