• growth plate -What Is a Growth Plate? Growth plates are the areas of active, new bone growth near the ends of bones. They're made up of cartilage, a rubbery, flexible material (the nose, for instance, is made of cartilage). When kids are done growing, the growth plates harden into solid bone. This happens in girls around ages 13–15 and in boys around ages 15–17. : 성장판 *출처: https://kidshealth.o..