When they start to get boobs. Simple as that.
Around 6th grade
I was seven when i got my training bra:P
It varies for everybody.. Just wear one when you begin to need to :)
When you fell you need to wear it..:)
Probably the age of 16 is normal to wear a bra.Actually wearing a bra depends on the size of the breasts.
Depends when you get boobs hun :) you can go to the bra/underwear section at macy's or someplace like that, and get measured. OH but dont just where one to where one it makes you look desperate to fit in...trust me i would know :P hope this helps!