When are you too young to wear thongs/g-strings?

Hogfan
I have a friend and her daughter is wanting to go panty shopping for herself...She is 14yrs old and is interested in thongs... I guess my questions is to the women:

At what age are you old enough to start wearing thongs or g-strings? What age would be the "proper" age?
When are you too young to wear thongs/g-strings?
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