It's a question i've asked myself several times as i'm only a couple of years younger than you. In all fairness, i'm sure that i'm going to run into some issues with my age and my chosen career path, but i'd rather give it a go than not.
Plus, with the way things are going, retirement age will probably be 75 in the not too distanct future anyway (wish i was joking there!), so it's not as though you wont have long enough to build a new career after your degree.