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