I sort of feel the need to want to settle down (I am turning 19 this year) within the next ten years. Funny thing is, I don't want children. Many of my (slightly older) friends feel the same way; they want to settle down with a man, but at the same time they do not want to deal with having children. God knows we still have those annoying siblings to bother with... haha.
In my case, maybe it is just pressure to live up to what your family has done in the past. I think that the fact that my mother had me when she was 21 contributes to my desire to be married by 24. Oh, and my aunt was married by the time she was out of college. That was just a few years ago.