The average penis length by age, outlined in Adolescent and Young Adult Health Care: The approximate ranges of a non-erect penis by age are as follows:1.
During puberty, the penis goes through a growth spurt. For many at age 16, that's an average flaccid (not erect) length of You also start growing hair around your genitals, under your arms, on your chest, and on your face.
Research says the average length is 3.61 inches for a flaccid penis and 5.16 inches for an erect penis. 3.61 inches, while the average length of an erect penis is 5.16 inches. . It's normal for penis size to decrease with age.