Marry you at 30?

At some point in our lives, we've all made or at least considered the "if we aren't married by the time we are 30 we'll marry each other" promise with a friend. But who actually takes advantage of something like that? You make a promise with someone that you knew 10 years ago, and the reality of it is that A LOT changes in 10 years. What are the chances that you still keep in touch with and more importantly is still attracted to the the "promise partner" of the future? I mean if you can in fact actually see yourself with that person forever, if so why haven't you hooked up with them yet? Would you really be able to be in a relationship knowing that it happened just because it was a promise that you made when you were 18? Everyone is always on a quest for "their soul mate" and 'true love" so what if you marry someone because of the promise and then meet your "soul mate" the year later? What do you do? Is there anyone that actually takes advantage of the "marry you at 30 promise? So to anyone that I may have made this promise with, I'm sorry but I take it back and we should both continue our searches alone. Who knows if its meant to be our paths may cross once again.