How big should 10 year olds penises be?
Asked in Health
How big is your penis suppose to be at age 12?
Penis size for 12 year old males can vary significantly. Some 12 year olds will have penises that are almost like an adult's and will be from 5 to 6 inches when erect. Other 12 year olds have not yet had the rapid penis growth that occurs during puberty. Their penises might be 3 or 4 inches when hard. Because the age of puberty varies, it is normal for 12 year olds to have erect penises anywhere from 2.5 to 6 inches.