I was around the same age. My dad was a big ZBasic fan, and he had me copying BASIC games out of a book and getting them to run, on our Tandy 1000. My oldest is 5, and I'm trying to figure out the best time to expose him to it. With the entertainment-focused nature of computing we have now, I can't rely on the lack of distractions that were present with a non-networked computer with a monochrome display. Right now, we don't even have a regular computer for him to play around with—my wife and I have our own laptops—so I think the first step is setting up a desktop machine that the kids can fool around with.