Will,
At the moment, I'm at University, and to be honest, I'd recommend it. Its a social growth, and most sponsorship schemes look for people who are well rounded individuals. So, if for instance, you go to University, get a good degree and excel in a club whilst you're there, chances are, you will have a good chance coming out of Uni of getting where you want to go. Plus, its always good to have some sort of contingency.
As I said, I'm at uni, I'm going to take a few private lessons, just to give myself a few hours and register my interest on paper. I'm vice president of the rowing club, and enjoy the experience. People overlook how important social skills are to getting a job in the industry, and three years at university in this respect, are absolutely priceless.
As already mentioned, you'll only be 21 when you finish too. Not too old at all.
Hope I've helped.
MS