The third stage of male puberty occurs around age 13 or 14, but frequently as early as 11 or late as 16. Pubic hair begins to grow darker and fuller, and the penis now begins to grow in length. The testicles continue growing, erections become commonplace and the boy gains in height at a rate of over 3 inches (7.6 centimeters) a year. The voice may begin "breaking" or "cracking." This is when the boy's voice suddenly and uncontrollably changes pitch mid-word or sentence, due to the growth of the larynx and the lengthening of the vocal cords.
Stage four of male puberty commonly takes place when a boy is around 14 or 15 years old. Hair begins showing up in the armpits and on the face, and pubic hair begins to grow coarse. The boy's voice will even out and become deeper. The stage-four boy can use this deeper voice to yell forcefully at the mirror when he sees his new acne, due to his ever-more-oily skin. He begins to grow taller and even faster, at about 4 inches (10.2 centimeters) a year. The penis now grows thicker and continues to lengthen.
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