I admire the people that wait til marriage, but I don't believe in it.
To me I don't see what the difference is if you have sex before or after you are married, at the end of teh day its your own personal choice and it doesn't affect who you are as a person.
Its the same for age, to a degree, obviously 14s still a bit young, 15's not as bad, and 16 is perfectly alright as it is legal.
I'd say it's up to the individual, but if you're going to do it, at least be careful.
I had a friend who had sex before marriage - made a right mess of the wedding dress! You should have seen the state of her, walking down the aisle!
Ahahaha.