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For boys puberty begins at an average age of 11 ½ or 12 years. The first sign is an increase in the size of the testicles. This is followed a few months later by the growth of pubic hair.
Puberty continues with an increase in the size of the testicles and penis and continued growth of pubic hair and underarm hair. Physical growth usually begins with an enlargement of the hands and feet and is later followed by growth in the arms, legs, trunk and chest.
Other changes include a deepening of the voice, an increase in muscle mass, the ability to get erections and ejaculate. Some boys experience breast development. Boys undergo their peak growth spurt about 2-3 years later than girls.
As with overall body development, the timing and rate of penis growth can vary greatly from one individual to another, but will usually be in line with overall development.
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