i guess most of the fandom is old because they were there when stuff happened. i was!
when you get older your interests kind of fluctuate around coming back and being idle. it's normal.
just because you are an adult, doesnt mean you stop liking stuff.
in fact, the more u live the more stuff gets added to the box of things you like. and it's cool seeing parallels over that.
shit you like will never leave you even when you think you are over it.