I have a daughter who's 17. I also have mentor many children being a martial arts instructor. I agree.. 12 is WAY to young. 17 maybe. 18 for sure if they aren't under my roof any more. lol.. It promote them showing off their bodies. So when she comes home prego at 15 and the mom or step mom, whomever, is wonder what it was that went wrong. Remember, you're a parent, not a best friend. To be honest, I may even concider at 16, but never at 12. This is the age to teach them that they can be beautiful w/o showing all their skin. They are little princesses. At this time nail polish is cool. I can even agree with ear rings and rings. Not tongue rings, lip rings, nose rings, etc.