I think that you could still wear one up to when you become around an a cup because then you probably need more support.
I am 13 and still wear one because I am only a 30aa but that is just my opinion. I have been wearing one since age 12 as I was flat up till then.
I am 13 and still wear one because I am only a 30aa but that is just my opinion. I have been wearing one since age 12 as I was flat up till then.