by 
annoymous
ANSWERS: 2
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In terms of years, the penis usually begins to grow at the onset of puberty until the body stops growing, usually between the ages 20-23. The penis will usually grow in synch with the rest of the body, and on average grow to the length of about 5 inches fully erect. The non-erect penis usually does not even reflect half the size of an erect penis, so length should be measured only by erection.
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about 4 years
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