I'm 23 now, and have been a bit of a computer geek since college. I would say.....15 years of typing, maybe 6-7 of serious typing? I did benefit, I feel, from the fact that I have always touch typed. I listened during typing class in 3rd grade that touch typing was the best. Even to this day, I don't type one (non number) character until all 8 fingers hit the home row. Even if I'm just typing "yes".
Another strange thing is that my elbows are always out to the sides which, with my wrists straight, makes my fingers hit the home row at an angle similar to \--------/. I have gotten used to this angle and thought it was how everyone typed. It was only recently that I saw pictures and learned that some people have their arms like mine, but cock their wrists to that their fingers are addressing the keyboard perpendicular to the home row. While on the home row, my index fingers are almost fully extended and my fingers are more bent toward my pinky which is bent pretty far to stay on the outer keys. This really only is a drawback for the letter "Y" or now "J" since I actually have to more my whole arm slightly to reach it. I feel like my way is better, although I only started doing it because it was more comfortable - not knowing that it should reduce and RSI or CTS later on.
As far as "keybr.com" that will be a great test. I imagine I'll still be quick, but I don't think I'll be nearly as fast if I can't burst through words. It's blocked from my corporate IT firewall of death, but I'll give it a shot when I get to another computer, and report back.