I got wed when i was nigh on 23, i had been seeing my wife since we were 17,and we were both sure we knew each other inside out by the time we decided to get hitched.(we both had "friends" in those years, but were always drawn back together).
That would be my advice, Love is only the first step, it's not the be all and end all,problems arrive if you don't truelly "know" your partner.
Another thing with marriage is having children, i don't care what you say, we were all put on this Earth for one thing and one thing only...to Procreate..., and that is when yor life really starts, it's life changing, and gives your life new meaning. <img src="/ubbthreads/images/graemlins/wave.gif" alt="" />