Although some of the changes of puberty can carry on until the early twenties or even later most boys penises will have reached their full length and girth by the late teens. The average length of an erect adult penis is 6 to 7 inches.
The penis is normally fully grown and developed by the age of 21.
How would you know it wasn't fully grown? It is most likely that it will not get noticeably larger.
That might be the full growth
I wouldn't think so, as by this time the rest of your body is fully grown.
AGE 7!
no. a maltese is fully grown at one year of age
The average penis length in fully grown men is 5-6 inches.
A marmoset monkey is fully grown at 15 months of age. They are already sexually mature at this age but are unable to breed until they are dominant.
ida
She's immortal and was born fully grown.
about 9 months
at the age around 2