What Is the Average Penis Size for Boys and Teens? - Penis length charts by age
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Age-specific percentile curves for penile length, penile diameter, and testicular volume were drawn using the generalized additive models for. Average penis size. For many at age 16, that’s an average flaccid (not erect) length of about inches and an average erect length between 5 and 7 inches. The girth (circumference) of a flaccid penis and an erect penis average about inches and inchesTrusted Source.