There has been a lot of discussion about sagging boobs and if a bra will keep them from sagging. There are some that say yes, and some that say no. If you go without a supporting bra for extended periods of time, and you have larger boobs, then eventually your breast tissue will stretch and they will sag. The same thing happens to women who have breast fed. Their boobs get full of milk and the boobs stretch, and after breastfeed is done and over with they will sag. How much depends on how big your boobs were. Also genetics play a part, along with boob size, breastfeeding, and not having support. There is no reason medically that girls with small boobs need to wear a bra as they usually do not need the support as large boobs do. My aunt had small boobs and they were still perky at 60. If you want to be free and let them hang and it makes you feel good you can certainly do that. Women's breasts naturally sag with age, bra or not, depending on size so be free my little melons.