Peter J. Hatala
If you don't mind sharing...I'm wondering who on this forum is married? If you are, at what age were you/your spouse married? If it was at a relatively young age, do you wish you had waited until you were a bit older? -I'm not married...btw.
As my wife already mentioned, we got married at 20 and 23. I'm not sure if that's "too young" or not. Many people in America would say that we should have waited longer (the priest who married us and our sponsors being some of them!
). On the other hand, in many societies, people married at 17, 16, and even 13. Yet, those societies were very different situations (e.g., the life expectancy was 20-30 years less, educational period in life was much shorter for most, etc.).
The events surrounding our marriage were a bit unique, so my wife and I did get married a bit sooner than we had planned (by about 5 months). I don't think either of us regrets getting married at a "young" age though. Both of us had been seriously considering monasticism as a path, but when it became apparent that we weren't to go on that path, but were both to take the marriage, we just wanted to "get on with it".
There are ups, there are downs, we go through most of the same problems that everyone else does. We have fights, we make up, we pray, we fail to pray... normal marital hills and valleys. Of course, we keep our eyes on those marriages which were not normal (as seen in the lives of the saints), but right now we feel at least "normal" (ie. we don't feel like we have a lesser chance of making it than any other couple).
I guess it comes down to two main factors: maturity and determination. Love doesn't keep marriages together (though it makes them worth having!), having determination, and the maturity to work out problems, is what keeps marriages together. Oh, and a little cultural stigmatization of divorce helps, but we don't have that now (even in our Christian Churches). Mary and I aren't mature to any great degree, but we have enough determination (and a solid foundation) that when our maturity fails (which is often), we make it through anyway.
Here's the part that's dangerous for young marriages, though. First, if the determination isn't there, the marriage will have a hard time lasting. Even if there is determination from the beginning, though, the maturity must develop in time, or the marriage will still fail. Too many people get stuck in a "maturity rut" and stay where they are, never learning to deal with life's graces, problems and hassels in an increasingly more mature way (e.g., in an increasingly christocentric way).
Anyway, I'm hardly one to be speaking on marriage considering that I've only been married for five months. Take the above with a grain of salt. 
Justin