Stages of Development in Adolescent Males

Stage 5

Typical Age Range

This stage starts when growth in height stops and lasts the rest of adult life. On average it start around age 17, but can start as early as 15 or as late as 20.

Even after stage five is reached, changes still take place for the first few years.

Growth

Growth in height stops.

Genitals

Scrotum is at its adult size. Testes are longer than 1 3/4 inches (4.5 cm) long measured along the long axis or over 20 ml in volume.

Penis has full adult characteristics.

Hair

Pubic hair covers groin and the inner thighs.

Chest hair develops

Full facial hair develops

Body

Muscles are easily developed

Shoulders widen to give a typical male physique

Chin widens, giving a squared off look.

Attitude

Brain continues to develop reaching typical adult thought pattern by age 24.