The Commodore 64 was both my first computer and first gaming machine. It came with books on how to program, and there were several "how to make your own games" books available at my local libraries as well.
Using a book borrowed from a neighbor that detailed how to make your own "choose your own adventure" style game, I began work on my first video game in 1988 (when I was 9 years old). Wavering interest and lack of programming skill (I was pretty young) meant I only did a little work at a time. The game was finished and playable a couple years later, under the title "Alien Fear".
When I was 14, I'd learned quite a bit more about programming, so I overhauled the game and renamed it to "Xenophobia". This version was distributed through a friend's father who was a member of a nationwide club that traded C=64 software.
There's no telling how many people have gotten ahold of my game, but I was pleasantly surprised when I met someone in 2000 who claimed they were a member of the club and had received and played my game years earlier.