oh, man.. I'm almost too late!
I have one 15yo girl who does not show any interest in make up. Then again, I don't wear it myself and she doesn't go to school so there isn't the pressure to "fit in". At her age I'd have no problem with it for sure. Don't know when/if it will be an issue with the younger girls. They just like to decorate their bodies (face, arms, legs and tummies) with markers.