How Large?!
Question:
How Large?
what is the avg size of penis for a 18 -20 year old??
Answers:
The average penis size is 6 inches (for adult Americans). Penis size depends on your race (White, Black, Asian, Hispanic, etc..). The average girth (penis circumference) is around 4.8 or 5 inches.
Usually at the age of 16 to 18, your penis growth slows down.
check my source
http://en.wikipedia.org/wiki/penis_size...