depends on the testerone of the young man. some increase by 50% some just 10%. around 12, 13 years of age they get that boost and then again around 18 or 19.
it can grow at any rate it has been showed to peak at age 17 and then gow down and inch or so. but its all about gens nd genetics
around 12-18
Not too fast. I like small penises, just so you know.
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