Sorry, i think a normal cock quits developing about age 16 or 18. Mine was full size at 12 or 13. Although the base of the shaft continued to get bigger with use.
I’m not sure about other guys but I can tell you that when I was just about 13 years old my cock was much bigger than the other boys. I measured 7 1/4 inches long and 5 3/4 inches in circumference. I used to be able to suck on my own cock. It has always measured the same size. It’s just thicker in circumference these days
By #7976 at 01,Sep,09 01:57
I don't know at what age it reaches full size but I can tell you that it reaches it's limits quite frequently.
The site medical officer concurs!