I can sort-of-touch-type at 75 wpm with about 99% accuracy. I do need a sort of overview of the keyboard; I don't have to look down at it, but I need to be able to sort of see my hands and the keyboard down below the screen someplace. I started chatting online at 14. Now I'm in my thirties, but I had this skill by the time I was 20 or so.
My hands are massive and it hurts me to place them on the home keys, my fingers don't want to be that close together in that position. So I type with about three fingers on each hand most of the time, backspace with the right ring finger, special keys with the pinkies, space bar with the right thumb like normal, most of the time. But sometimes I'll use the left, a habit from using it for paging while mousing.
IOW you really don't necessarily need to learn touch typing, but it's going to take a fuck of a lot of typing to gain proficiency otherwise. I spent most of the time between about 13 and 17 in front of a keyboard.