I guess I'm similar to thedrewbert. I was only slightly above average, i guess. And then, within about 1 year I gained about 4 inches. It was really bizarre to me at the time, but I figured out that it wasn't any kind of mutation. :) It slowed to a slower growing rate afterwards, at about 1 inch per year, until I am where I am now. :) Yay me! :D