?What changes in body structures for girls and boys?

As girls mature, they would start growing their breasts as well. As what I have learned from lotusmedicalinternational.com, between the ages 13-21, their boobs would have fully grown. However, there are other girls who are not endowed with larger breasts, thus, they undergo breast augmentation procedures. Other than that, hairs on private parts would grow. Meanwhile, boys would also have hairs grown in their private parts as well. Our body structure would change as we grow.