Average Erect Penis Size by Age

Below is a list of the average erect penis size according to age. 

– 0-5 months: 1.5 inches (Stretched Penile Length)
– 6-12 months: 1.7 inches (Stretched Penile Length)
– Age 1-2: 1.9 inches (Stretched Penile Length)
– Age 2-3: 2 inches (Stretched Penile Length)
– Age 3-5: 2.2 inches (Stretched Penile Length)
– Age 5-8: 2.6 inches (Stretched Penile Length)
– Age 10: 2.9 inches (7.4 cm)
– Age 12: 3.4 inches (8.6 cm)
– Age 13: 4.0 inches (10.1 cm)
– Age 14: 4.5 inches (11.5 cm)
– Age 15: 5.1 inches (12.9 cm)
– Age 17: 5.6 inches (14.3 cm)
– Age 19: 5.9 inches (15 cm)