When I was a teen people would refer to a “lot” of masturbation as to “lengthening” your dick, but not literally, although other kids with shower dicks would say stuff like “you got a lot of fapping to do to get to my size”, and some would say it literally.
My opinion is hell yes, probably better results if done correctly than as an adult.
Anyway, having a big dick is the THING where I am from.