Delayed puberty affects the person whose puberty is delayed. Puberty is a process with huge variation from person to person and although the average ages for boys to start puberty is 12 or 13 the average range is from 9 until the late teens. If you have no visible signs of puberty by the age of 16 (growth of hair close to penis or in armpits, deepening of voice or enlargement of testes or penis) you should see your doctor and ask for advice.