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Ages & Stages

Boys' Secondary Sex Characteristics

Usual Age Range

The testicles begin to enlarge, and the scrotum turns darker and coarser

10 to 13

Pubic hair begins to grow

10 to 15

The body grows taller and heavier

10 to 16

The penis begins to grow longer and fuller

11 to 15

The voice begins to deepen

11 to 15

Boys become fertile, meaning they are capable of ejaculating semen

11 to 17

Hair begins to grow under the arms and on the face

12 to 17

Glands in the skin and scalp begin to produce more oil, which can cause skin blemishes

12 to 17

 

Last Updated
5/11/2013
Source
Caring for Your Teenager (Copyright © 2003 American Academy of Pediatrics)
The information contained on this Web site should not be used as a substitute for the medical care and advice of your pediatrician. There may be variations in treatment that your pediatrician may recommend based on individual facts and circumstances.