Re: Penis Girth
I've read from only one resource (I don't know that much about girth) that the average girth is 4 to 5 inches.
I highly doubt that penis girth grows last though. Also, paper towel rolls vary, so I don't think that's a good comparison either. Just get a measuring tape and measure it man!
My girth - 4.5 inches
There is no specific age that the penis stops growing. It slows down in the late teens, usually. Flaccid sizes...hmm...really, I don't see the point in average flaccid sizes.