Question: At what age does penis growth begin?
Answer: Penis growth usually starts between the ages of 10 to 14 years of age. The testicles enlarge first and pubic hair starts growing.
The penis grows in length first and girth slightly later. Teenagers have to wait for one or two years after they stop growing in height before they know their final penis size.
Source:
Biro FM; Lucky AW; Huster GA; Morrison JA. "Pubertal staging in boys." J Pediatr 1995 Jul;127(1):100-2.
