Seeing comments like this a lot in relation to the Oasis tour, but have seen them in relation to other bands as well!
I was a baby when Take That split up, but knew of them and liked their music and became a fan by their reunion. By some people's reckoning, I can't be a fan of Take That because I was too young to know anything of them in the 90s.
So AIBU to think that because you became a fan at a later date doesn't mean you can't be a real fan? Let everyone enjoy the music!