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I work retail and the majority of the people I see walking around in pokemon merch are adults, every once in a while it'll be a very young kid like toddler to about 6, very rarely the 10+ kids. Back when I still played Go even on weekends and during the summer it was mostly adults at the parks, a handful of kids dragged their parents into it but there were just as many kids who were pulled into it by their parents being pokemon fans, and about as many older folks who knew about it because it was everywhere and just wanted something to get them out and moving but more casual/social than a gym or sports. I remember even as a kid there were plenty of adults and older kids/teens who were genuinely into it and it wasn't hard to find younger kids who liked it until late gen 3, after which younger kids really didn't care and getting assigned to help out in lower grade level classes (my school district did a lot of that kind of stuff to give young kids an older friend to look up to and their teachers a hand) was awkward because I had no idea what else to try to relate to them with. Oddly, among people I know personally about 30 seems to be the cutoff point for having gotten into it at all during pokemania, most of my friends under 30 were all about it even if they outgrew it and never came back and most over were either the older siblings that avoided it like the plague because their younger siblings drove them nuts with it or simply never cared, the outliers being one couple a fair bit older who are both turbo nerds raising their kids now teenagers the same way.