As an 80s kid, hitting 40 was the best thing that ever happened to me. Shit that used to matter suddenly doesn't, like you flipped a lightswitch. You get new superpowers, and they're all bitchy. I recommend it to everyone.
I started playing it late 20s. It really is a game anyone can enjoy. Particularly the Java version with modpacks (some of these modpacks are probably actually unplayable by children because of how complicated and technical they are).
Same. It's about 90s culture, isn't it? I was born in the early 90s, I didn't consciously experience a lot of 90s things. My formative years were the 00s, therefore I'm not a 90s kid.