this point about social and parental pressure is really important:
I say this as someone who married late, and since I wouldn’t want to have married anyone except my husband, I’m glad I waited. But as a general rule, you should err on the side of marrying early. By which I mean not that you should marry whoever happens to be around when you turn 22, but that you should be willing to recognize, at the age of 22, that you’ve found someone you want to marry. Right now, most Princeton students don’t think that way. They think there’s something weird about committing at 22. And if they try to commit, their friends and parents will warn them off.