Well it depends. Usually around 9. If you don't have anything of a bust just yet, wear a training bra because if you don't your breasts can begin to grow irregularly. But if your breasts are already...
Well, there really is no age, when you start to see that you cann see your nipples through your shirt or whatever you wanna start asking your mom to buy you a training bra or a cami, im 12 and...
There is no age for it. Some women never wear bras. Start wearing a bra when your breasts are becoming to heavy. If you have small breasts you may never need the nasty things. For swimming suits/...
We it pends on how big ur boobs are, i started in 3rd grade but mine were quite bigger than the other girls in my class. My little sister is in 3rd and all ready wearing them