30. Age when married.
Sex outside marriage always leaves scars.
Honestly, Choosing to wait is fine. For whatever reason, even... gulp.... a religious one. But to make a sweeping statement like "sex outside of marriage always leaves scars", is demonstrably false and definitely coming from a very narrow minded point of view. The degree to which you are in error here is only matched by the degree to which YECs are in error as to the age of the universe.