In newborns, the bones are not completely ossified; at their ends there is epiphyseal cartilage, or a cartilaginous layer, from which new bone tissue is formed in childhood and adolescence, up to 20-25 years.
CARTILAGE PHASE - During the growth period, there is cartilage tissue at the ends of the bones in children and adolescents. It is from this cartilage that bone grows in length.
BONE PHASE - As we grow older, the cartilage at the ends of our bones is gradually replaced by bone tissue. This process is called ossification.
ADULT BONE - By the age of 20-25, bone growth is completed and all cartilage is completely replaced by bone tissue. After this, further growth of bones in length becomes impossible.