When I was young, I hated broccoli and squash. As I matured, I started liking them. Why? My tastes literally changed.
Since we're throwing around anecdotes, I liked lasagna when I was 6. I still like lasagna as an adult. No one's calling into question changing tastes. We're calling you out for declaring someone else's taste is wrong. You didn't say it outright, but your original post pretty heavily implied it.
Adults playing a game with a 10 year old protagonist is a creepy as old men staring at little girls.
I can't tell if you're deeply insecure or just an exquisite troll. Are you seriously going to equate adults playing video games with child protagonists to paedophilia? If you'd said "adults playing games with a 10 year old protagonist is as creepy as adults who watch My Little Pony", I might have been willing to let it slide as rhetoric. Instead you went and implied that anyone over the age of 18 (or whatever age you consider an adult) who plays a video game with a child protagonist is harbouring paedophilia tendencies.
Just to be clear, are you saying everyone who played and enjoyed Child of Light (with a female child protagonist), The Last of Us (that features a barely-pubescent Elle as a co-protagonist), or the The Legend of Zelda (Link is described as "a young lad") is a paedophile? If you want to make that argument, by all means, go for it. I'll hear you out and we can debate it like adults. But at least have the courage of your convictions and say it as a declarative.
Or, you know, you could not shit on someone else's hobbies in order to give yourself a sense of superiority.