Hey all. I'm 18, but I'll be 19 around the time summer starts. I was wondering....is it too early to start doing any PE exercises? Someone told me once that I might grow a bit through the age of 20. I'm only about 5.5 in long and just under 6 in wide though, so I really want more length.....what do you think? More info: I honestly don't know quite where I'm at development wise. People say most men are done by 18, but when I checked myself in reference to a development chart, I'm still creeping up in some aspects. The biggest hint with me is my body and facial hair. I've never shaved in my life, yet I have no mustache, and just the smallest amount of fuzz on my chin. My armpit hair is damn near non-existent. My voice also doesn't seem to be anywhere near where it should be, and still cracks at embarrassing times. So because of all of this....am I wrong to think my penis isn't done growing yet?