Then again there's a certain sector of the US (formally Confederate) where reproduction starts at an early age, and there are people who are grandparents by the age I was when I first did the deed, which was 27.
That may be a little high of an age, but unlike these Bible thumpers, I actually really did believe in those Christian values of saving it for marriage. Unfortunately everybody was already married or simply not a virgin anymore by that age, so I had to give up on that quest.