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Stages of Development in Adolescent Males
Stage 4
Growth
Growth begins to slow, though an additional inch to three inches will be gained.
Genitals
Scrotum distinctly hangs and takes on a darker color. Testes are between 1 1/2 to 1 3/4 inches (4.1 to 4.5 cm) long measured along the long axis or 12 to 20 ml in volume.
Penis continues to grow, but mostly in width. Glans at the end of the penis widens and develops a distinct corona.
Hair
Pubic hair is pigmented and curly, spreading across the groin. A strip of hair forms from the groin up to the navel. Hair under the arms becomes denser.
Facial hair develops on upper lip, chin, and near ears. Continues to spread across the face as this stage continues.
Voice
Voice deepens.
Body
Acne breaks out on face and body.
If breasts stands out, it begins to disappear. Nipples stick out and become both harder and more sensitive to touch.
Muscles begin to develop
Shoulders begin to widen to give a typical male physique
Attitude
Still tends toward extremes in mood, though this settles down a bit.
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