I think that's only because you had more time to accumulate 90s memoribilia. If they had siblings born earlier, they would have been born into 90s hand-me-downs, molded by it.
I mean what parent would buy a tamagotchi when it was culturally relevant for a 3 year old unless they were swimming in cash. But they'd buy one for an 8 yo and the 3 yo would grow up with it.