You hit puberty: There are 2 types of penises. One kind that expands and legthens when becoming erect (a grower) the other appears big most of the time, but does not get much bigger after acheiving an erection (a shower). Most of human penis growth happens btw infancy and and the age of 5. And between about one year after the onset of puberty aprox age 17.
Answered 12/26/2013
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