My Father is 85 and my mother is 77 they still bike on their local MUP. Not very fast, maybe 5-6mph but they are thin and try to get excersize that way. You wouldn't see them on this forum though because they don't know how to use a computer nor do they have one. LOL. I don't know very many people that age that know how to use a computer anyway but alot if them cycle regularly.