I am only 21, and my fiancee is 22. We have been together since high school (nearly 5 years now). That is longer than some marriages. As far as we are concerned, we would just go ahead and move in together (would have done that a little while back), then wait for graduation to get married. Her parents do not approve of that kind of thing.
So the deal is this: we both get our Bachelors this semester. We then are both getting a msters in another year. I already have a $50k / yr job lined up from coop (EE/Comp.E stuff), and she plans to get her PhD (English) and teach.
We decided to go ahead and get married this August instead of waiting until graduation. Why? Society tells us that we should wait. We decided that we know what is best in our situation, not the roaring masses. So

to you who think young marriages don't last. My parents got married at 22 (like me), and they have been together for 29 years. My fiancee's parents got married when her mom was still young (19). Her dad is considerably older, but they are quite happy.
It really pisses me off when people comment that I am making an error by getting married at a relatively young age. I get the attitude that I am too 'educated' to make a 'mistake' like that. Noone knows me well enough to make judgements like that other than myself, and Ruth. She probably konws me better than I.