At what age does a boy's penis stop developing?

Under normal circumstances, the male penis will stop developing at the age of 18-20.

In adolescence, the penis will undergo secondary development, when the reproductive organs in the body gradually develop completely, hormone levels increase, which will promote penis growth and thickening. Usually, the body will basically develop completely at the age of 18-20. At this time, the penis will stop developing. However, due to personal constitution, diet, environment and other factors, different boys penis length may be different, if the penis length in the relaxed state between 3.7-10.6 cm, belongs to the normal situation, erection penis will appear growth.