How big should a dick be
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What’s the Average Penis Size?
Average Penis and Erection Size: What’s Normal?
Average Penis Size for Boys and Teens
Description: Learn About the Stages of Puberty in Boys. Is that 4. Knowing what to expect—and what an "average" penis size really means—can help alleviate a lot of the stress. I'm not sure what the penis size for a 13 year old is, but I'm 13 and have a 4.