What is the bra size for a 12 year old girl?

I'm an 11 year old and I wear the bra size 32A but it really depends on the person. I am guessing you should wear a 32 or a 34, anything slightly different is fine.

i am 11 and i am a 32A too.This is about average.But for a 12 year old i think it is about a 34A.