There is hope to grow taller at the age of twenty-one. You can go to the hospital to take a film to see if your bone age is an adult standard. If not, you can achieve the goal of growing taller through hormone and drug treatment. If your bone age is an adult standard, there is no hope, but you can go to a plastic surgery hospital for osteotomy, but the risk is greater! My knowledge is limited, I can only provide this information for your reference! Hmm. How interesting