The real answer is I don't actually know. The first dedicated gaming system I had was a GBA and I almost certainly owned some PC games before that (voted Windows in the poll), but I also was introduced to games at my cousin's and other places when I was young and I couldn't give you a chronology of all that stuff and at the time didn't have the awareness to know what systems any of those games were on (some I know in retrospect because I now know what games released for what systems, but I still couldn't tell you when exactly I first played any of those games and there's probably gaming experiences from back then that I don't remember).
There wasn't an exact moment when games entered my life. They were always around, even if they were only at the edges of my awareness for a while