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The potential age of your offspring if your first sexual encounter would have produced a child. This is an important metric for the older man on the prowl looking to hook up younger women.

It is best to avoiding coupling with women under kidage.

This sidesteps the potential awkward conversation when you find out why the girl you just slept with, looks a lot like the girl you smashed on spring break 21 years ago. (Hint: She's your daughter)
Bill : This club is full of hot chicks.
Mike : Dude, did you see the giant X's on all there hands, there is not a chick in here that is not under your kidage.

Friend: I used to think Bob was a total tool since he was a virgin until he was 29, His kidage is illegal in most states.
by pcat4k April 16, 2014
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