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The most reliable way to do this is simply to wait until puberty has completed. The genitalia of both females and males changes during this time, and one of the changes in males is the enlargement of the penis. Puberty normally starts between the ages of 9-14 in males, and can last a number of years, normally finishing before or up to age 20. More information on puberty can be found on the BBC's interactive website.

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14y ago

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