I was 8 when Pokémon landed in Finland and watched every single episode on tv. Our parents did not approve of video games though (barely got a GameCube when I was 12) and although almost everyone at school was a huge fan of Pokémon, no one in our tiny 20-person elementary school in the countryside had a GameBoy. We watched the series, bought the toys and collection cards and so on, but the games were nowhere to be seen. Maybe because they were expensive, maybe because they were in English (and we barely started very basic English studies in school at age of 9), maybe because people were not that familiar with video games at that time and place. Who knows! We still nonetheless loved Pokémon and considered ourselves hardcore fans.
Then our family moved elsewhere, years passed, I had other interests like Harry Potter and made some friends who introduced me to horse riding. Then we moved in the middle of nowhere and surfing internet became my only hobby for a while... x'D Anyway! When I was 16, first year of Finnish high school, I bought myself a DS and started up Pokémon Diamond. And I was in love. It was so addictive, collecting a diverse team was engaging, exploring the map was fun and collecting the gym badges was awesome. I feel like Sinnoh was not a bad place to start. I've played every game since (Heart Gold and X were the best for me), but Some Sinnoh designs are still my favorite (Lucario, Luxio, Glaceon). Geeking out with Pokémon has been my favorite hobby and allowed me to make some good friends. It's also actually pretty much the only interest I still share with my best friend.
I've spent years getting frowned on by my family for liking something "as childish" as Pokémon, especially my little sister who rolls her eyes at anything geeky unless one of her friends loves it. But luckily my husband and best friend always shared the same interest for Pokémon. In my experience the group of "grown-up people" (meaning 16+) who still love Pokémon after all these years has been small but geeky and supportive.
But now that Pokémon GO is out, Pokémon is suddenly mainstream again! EVERYONE plays it, including my sister! I have mixed feelings about it. Of course it's nice that it's so popular, but also really strange. It's weird to hear 13-year-old kids in the street say "Hey it's that purple one" when a year ago anyone who talked about Pokémon would have been able to name them. But overall it's cool, it's great that so many people are rediscovering (or discovering) Pokémon again, and I'm definitely happy to see a surge in Pokémon merchandise again. :3