Process: Puberty for Boys

Puberty is the process of sexual development. In boys, puberty usually occurs between the ages of 12 and 15 and lasts 3–4 years. Hormones secreted by the pituitary gland cause levels of the male sex hormone testosterone to rise, stimulating changes such as genital growth and the development of secondary sexual characteristics.

Physical development

During puberty, the penis, scrotum, and testes enlarge, and pubic hair grows. Hair also appears on the face and other parts of the body. Rapid growth occurs, the muscles develop, and the voice deepens.

From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.

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