If we are adopting the ‘media culture’ view, then you need to at least be around 6 to start making the abstract connections necessary to make lasting memories about media.

So in 91, some ‘90’s kids’ are turning six and able to effectively even be cognizant of a council, whereas some 90s kids are yet to be born.

Or all generational cadres are made up arbitrary bullshit but if you watched Ducktales AND Rescue Rangers, and knew bugs bunny when he was still racist, then it is likely you and I will have a lot more in common than 90s kids who knew Spongebob and Blues Clues.