So if as a Christian you are supposed to wait until marriage, I say marry younger than we have in recent Western culture. They can have your kids younger and enjoy the fact that their kids will be on their own by their mid-40's to early 50's. They'll likely have money to travel and enjoy the world... and still be young enough to really enjoy it!
I have mixed feelings about this as well. I went to a Christian college where LOTS of my friends got married early. I have close friends who seemed happily married but then went through terrible divorces ... largely because they didn't understand what they wanted out of life when they got married, or failed to read some serious red flags because they were so geared up to get married. As far as I know, these people waited to have sex.. and it didn't seem to do them much good.
On the other hand, my brother got married at 19 and they seem to be doing well.