Here are some...: Known to us, physical growth naturally stops soon marking into adulthood, which for men is age around 18. At 13, I would not worry as long as all secondary sex characteristics like pubic hairs, testicular size, voice change, etc. emerge timely. The penile length of a 13-y-o, is about 7-10 cm at erection but with a wide variation. More? Seek time counseling....
Answered 6/17/2017
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