Call your local tattoo shop and talk to their piercer they can tell you the age. In most states you need to be 18 to get a piercing without parental consent and you also need to be 18 for any genital...
Emancipation is at the discretion of court. The younger you are the less likely the judge will grant an emancipation order. If the child lives in an abusive situation he may be removed from the home...