I answered as close as I can remember, but I think touch typing is more of something I kind of picked up as time went by, rather than something I specifically learned at one point in time. I remember pushing myself to practice touch typing at various points, but the general recollection I have is that I didn't really practice in a focused, systematic way, and yet now I can type this without needing to look at my keyboard (and in fact, when I look at my keyboard I'll be likely to make more mistakes).

So I probably picked it up in my early twenties with a lot of typing of homework and essays and posts on forums.

By “touch-typing” do you mean typing without looking at the keyboard, that and typing using all ten fingers, or that and using the formal start-with-your-fingers-on-the-home-row techniques?

I replied randomly

Note: I did not read the first paragraph and mistakenly answered the first two questions nonrandomly. Both of these questions have a spurious N/A answer.

I said 'primarily through own efforts', but 1) really I partially learned through a class, and partially independently of it, and it's hard to recall the mixture of influences, and 2) 'efforts' is not really the right word, since the learning was really incidental to the fact that I was typing a hell of a lot; it wasn't a deliberate act.

Not sure how this influences the survey. :-)

I'm a sysadmin now, but I learnt to type when I was a rock critic.