I had mine done at 12, and my mother went MENTAL - I had never seen her so angry before. My best friend at the time sneaked off to get it done at a local hairdresser's, and I think it was the deceit that bothered her, more than the actual act.
I went on to have a few more piercings - had about four in one ear at point, including a high cartilage, and my belly button - but it turns out I am one of the 0.00001% of people whose bodies unanimously reject any and all foreign bodies, and they all grew out. Nobody told me about that. Also, I had a copper coil at one point. That was an interesting experience, I should have done my research more carefully.
So, yeah, I don't have any now at all, and quite frankly I don't even know why I had them done in the first place: IMO, piercing is a bit odd for adults - but, hey you know, if you want to modify your own body, crack on - but it's downright weird for children, especially very young children, and especially very young girls. I'm not a fan.
Oh, and as for the idea that piercings 'aren't permanent' and 'will heal'? Nonsense. The holes will close over, but you'll be left with permanent scar tissue, the severity of which will differ depending on how your body heals. For some people who are keloid scarrers, that might be quite significant.