I bought these for my 9.5 yr old who doesn't have anything that needs support but is on the verge of blossoming and is feeling self-conscious about her "mosquito bites".  These are perfect as they provide her with the coverage she needs but it's not an actual bra and doesn't show through her clothing or anything.  No one can tell she's wearing it and it helps her not to feel sensitive.  Once there's something to support, these will be useless.  They will likely last long enough for at least one if not both of her younger sisters to wear.