How old do you have to be to get a sternum piercing?

Once summer is over i want to get a micro dermal sternum piercing. Ill be 16. I think my piercer is pretty lenient about the whole age thing. Technically i was supposed to be 16 to get anything pierced at a piercing parlor anywhere in my state i think, but since im all most 16 he went ahead and pierced my tragus.