Hi my penis is 4 inches hard and im 13. How big do u think my penis will be when im fully grown?
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Hi Jon,
Nobody can predict. It's what your DNA has in store for you that determines size.
Average for an adult male is 5 - 5 1/2". Some guys get big early and others later. You'd be about average for a 14-15 year old now.
Hope it helps.
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