A person born between January 1, 1982 and December 31, 1991 who lived more than half of their childhood (years aged 3-12) in the glorious decade of the 1990s. Some people born slightly before or after that range might consider themselves 90s kids too as long as they can remember part of their childhood in the 90s. This demographic would have enjoyed the golden age of Nickelodeon shows, the Disney Renaissance, Goosebumps books, tamagotchi, beanie babies, and Sega Genesis/SNES and later PlayStation/N64. Kids born in the late 90s are under the mistaken impression that they're 90s kids because they were simply born in the decade even though they have no real memory of living in it.
Ryan was born on January 1, 1987. He's the ultimate 90s kid!
Mike was born December 6, 1997. He thinks he's a 90s kid, but he's not.
Someone stuck in the 90s, a few of them not being from the 90s but into 90s shows and culture. Most 90s kids did grow up in the 90s but don't realize half the stuff they 'remember' is stuff kids from the 2000s also remember. They're stuck in a decade and won't let go of it, for better or worst. Most 90s Kids say everything in the 2000s suck because it wasn't from their generation, and most of the time they haven't even watched said shows that 'suck' without giving any backup to why except it not being from their decade.
Regular Kid: God I really like Regular Show and Penguins of Madagascar.
90s Kid: Those shows suck!
Regular Kid: Have you ever seen them?
90s Kid: No, I haven't, they won't be as good as anything from the 90s.
Regular Kid: Then how do you know they suck?
90s Kid: ....
Someone stuck in the 90s. They have boyband hair and play pokemon on their gameboy and wear those combat trousers with tassly bits hanging off them, or perhaps a pink camo vest top.
They go on about No Doubt and the Spice Girls. They are quite lame and say things like "radical" and "wicked" in a non-scene kid way, with the occassional "for the win".
Person 1: "I'm really getting into No Doubt, they're so cool, I wish I had hair like Gwen Stefani used to have."
Person 2: "Woah dude you're such a 90s kid."