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 starting to grow, ask a female parent or visit a bra shop, and they can measure you and fit you with a bra, a process that is not very invasive. It's normal to feel embarrassed about things like this, but try not to be, it's all a part of growing up as a female in our culture.
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If you look in the mirror and you can see your nipples through your shirt you should start wearing a bra.
I think girls should start wearing thongs when ever they want, even if it's at age 8 or 18.
It does not matter it depends on how big her boobs are I started wearing a training bra when I was 10
Most girls start in 4th grade but really you can start whenever you think needed. A lot of girls are completely flat even in 5th grade.