To take off on something of a tangent from the main discussion, I'd say that 28 is significantly older than 19. It's not just the time gap. 49 vs 40, for instance, isn't anywhere near as significant (but maybe I'll change my mind when I get there). People do an awful lot of changing during college and just after. You'll be a pretty different person when you're 25 than you are now. Part of it's chemical—your brain is still different from how it will be, and part of it is how your role in society changes. In any case, enjoy the ride!