Oh, goodness, no, you're not too old. My aunt took up riding again when she was in her 40s, and she does roping for crying out loud. And she wins, too. Of course, this is the same woman who used to sneak into rodeos after dark when she was a kid, to ride the broncs; and then there was that time when she was a teenager and rode her horse OFF A DAM into a river, and the time a few years ago when she lost her thumb while roping a calf...so...yeah. But you should totally take up riding again! I will be uber jealous when you do. ;)