I tinkered with ZX Spectrum macros from books/magazines occassionally when I was a kid... shame nobody was around to encourage me ever so slightly (once I got a games console, I stopped completely). I also meddled with websites a tiny bit, and had some programming lessons at school.

But I didn't get into programming seriously until I was 22 (VBA scripting for Excel at work). Sometimes I wonder how hard it will be to catch up, although so long as I stay ahead of the average CS graduate I should be OK. I think.