My mum has 3 girls. She waited for us to ask her to get them.
I asked to get mine done when i was 6. I remember it hurt, i cried for a few minutes after, but also remember walking out and feeling like I was carrying massive rocks from my ears. If i have a daughter I tihnk i'll be waiting for her to make the decision.
My sisters didnt end up getting theirs done til they were 19 and 21!