###Human: My sister has delayed growth for her 15 years of age. What should be done to improve her growth? ###Assistant: Hi. Good day. Thanks for your query. I am afraid that I do not have good news for you. In your sister's age, it is not possible to increase height of about 2 or 3 inches with any medications. The growth plates in the bones close after 13 - 15 years of age in females and no increase in height possible. Growth plates are the areas of new bone growth in children and teens. They are made up of cartilage cartilage, a rubbery, and flexible material. For instance, the nose is made of cartilage. As kids grow, the growth plates harden into solid bone. A growth plate that has completely hardened into solid bone is a closed growth plate. After a growth plate closes, the bones are no longer growing. Growth plates usually close near the end of puberty. For girls, this usually is when they are around 13 - 15 years old and for boys, it is when they are about 15 - 17 years old. What is the height of your father and mother? Your sister may have an average height of both of them. Another option is limb lengthening surgery. Thanks.