I think its completely normal, you just found something you're really passionate about and want to get more things of that product. People do it all the time with other shows, games, movies, comic, sports, etc
I am 24 and I am thrilled by shooters and strategy games. Not a specific game like you but thrilled likewise. I think it's cool.
You may be a bit too addicted, but it's normal. I don't judge people for what they like. (except furries or bronies. Why the **** do full grown men like my little pony? The world may never know.)