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Boys Physical Changes:​ Puberty starts around the age of 10, when boys first start puberty there are no obvious changes but the male hormones are becoming active and the testicles begin maturing. At the end of this stage some boys begin a period of rapid growth. This happens usually around the age range of 9-12 years old.

During the age of 12-13 the first obvious sign is the testicles and scrotum begin to enlarge, but penis size doesn’t increase much. There is very little pubic hair at the base of the penis but you do begin to increase in height and change in body shape. This usually happens around the age range 12-13 but may start as early as 9 and as late as 15 years of age.

During the age of 13-14 the penis starts to grow in length but not much in width. The testicles and scrotum will still grow. The pubic hair starts to get darker and thicker and grows towards the legs. Height growth continues and they look more like an adult and voice begins to deepen. Some hair around the anus grows. This usually happens around the age range of 13-14 but may start as early as 11 and as late as 16 years of age.

During the age of 14-15 the penis length and width increases. The testicles and scrotum still grow. The pubic hair begins to take adult texture but it covers a smaller area. Most boys have first ejaculations and underarm hair begins to grow. Facial hair grows on chin and upper lip and voice gets deeper and skin gets oilier. This usually happens around the age range of 14-15 but may start as early as 11 and as late as 17 years of age.

Around the age range of 16 the final stage of development may begin, this is when a boy has physically become a man. The growth of pubic hair and genitals has an adult appearance, facial hair grows more completely and shaving may begin now or soon. During the late teens and early twenties, some men grow a bit more and develop more body hair, especially the chest area. This is usually happens around 16 but may occur as early as 14 and as late as 18.

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 * Stages of the Male Penis and Pubic Hair