The Boys' Growing Up in the Lord

Share this page with your friends

Bookmark and Share

Stages of Development in Adolescent Males

Stage 2 - Beginning Adolescence

Tanner Stages: Teenage Boy  in shorts serving as an example at Stage 2: Drawing by Jeffrey W. HamiltonTypical Age Range

This stage starts at the first signs of puberty and ends when the adolescent growth spurt begins. On average it starts around age 11, but can start as early as 9 or as late as 15. It typically lasts about two years.

Characteristics and Changes During Stage 2:


Puberty marks the beginning of this stage, though outward signs do not appear immediately. Puberty officially is the rise of gender specific hormones above typical childhood levels.


During this stage growth continues at a rate of about two inches (5 to 6 cm) per year.


Scrotum begins to swell and reddens color. Skin of the scrotum becomes thinner. Testes are between 1 and 1 1/4 inches (2.5 to 3.2 cm) measured along the long axis or 1.6 to 6 ml in volume.

Penis begins increasing in both length and width a bit. Spontaneous erections begin in this stage. About half of all boys gain the ability to ejaculate semen in the later part of this stage.


Fine, lightly pigmented (downy) hairs form around the base of the penis and under the arms.


A ring (the areola) forms around the nipples on the chest.

Toward the end of stage 2 the hands and feet become larger and out of proprotion to the rest of the body.