Does anyone know about when in a guys life their penis STOPS growing?
On average, at least.
I'm 16, 6.5" long and 4.5" around... so I'm not TOO worried about being bigger. I am just curious. 
Mon, 06/06/2005 - 02:15
#1
Age and the dick
This penis stops growing at the end of puberty. Usually around 18... but not necessarily. It grows in length first. Toward the end of puberty it is more likely to increase in girth.
Web link
You are actually on the higher side of average (average being around 5 to 5.5 inches). So you are fine.