Boys enter puberty at the age of 10-14 years old, and after they enter puberty, they start to grow and develop. Between the ages of 10-13 years old, boys will gradually increase in height, and this process will last for about 2 years. However, each individual has a different growth rate, but basically they all start to grow around the age of 10. If a boy is over 14 years old and still has not started to grow, he needs to go to the hospital to be checked if the lack of hormones is causing his secondary sexual characteristics to fail to develop. After puberty, androgens gradually increase in boys, so the testicles and secondary sexual characteristics begin to develop gradually during this period, and the skeletal closure stops around the age of 22. The later developing individuals will also stop growing around the age of 25, so boys will start to grow and develop when they are about 10 years old.