I get passed by younger women from time to time. Doesn't bother me at all. Solo female riders in these parts are usually pretty good. Not only a lot younger than me, but a lot more serious. I did feel a bit bad when I once got dropped by a female paceline. I would have thought a cute young butt in spandex would have been incentive enough to work just a little harder, but I didn't get more than about two miles before even that motivation was insufficient.