I'm "only" 43, so still a baby.
I'm the oldest person in my class, but so far it's been fine. I think it's true that learning some things becomes harder, but I think we're at an advantage because we value our education more than some of the younger, fresh out of high school students. I know I'm more willing to commit the time necessary to learn the subject, where way back when I first started college I was more interested in . . . well . . . everything! Besides, I've had bunches of people that have commented how "brave" I am going back to school at my age--no one's ever called me brave before!