15 years outside the target market

Today I went shopping at Forever 21 in the Mall of Disposable Clothing. The reason was to seek an outfit for a jumpsuit party later this month, but I ended up buying (cough)other stuff. But I had to wonder should I be buying clothing for just-past-teenagers? What did the salespeople think, especially when I brought the girls in to exchange an item later that afternoon? 15 years from now I might be back there with them shopping again.