When I was in elementary school, (I'm 25), Super Nintendo/ Game Boy Pocket were what was "hip" and "cool". Everyone had one, and everyone talked about the games for them. When I reached 6th grade and into junior high, N64 came out and it too became the system people talked about, albeit some people had gotten a Playstation instead of an N64 for Christmas and so even at a relatively young age the "Nintendomination" had begun to recede a little. Once N64 came out, I'd say 70% of people at my school still played Nintendo systems exclusively, and they didn't care about Crash Bandicoot or Gran Turismo or Playstation.
But I will say that I had a couple friends whose parents got them an N64 in 1996 or '97, but a year or two later they had their parents get them a Playstation. By the end of 8th grade, I'd say what was once like 90% Nintendo loyalty in my school decreased to around half that. The other half was the popularity wave of Tony Hawk, Gran Turismo, and Metal Gear, etc, and Playstation started to take over a little bit.
