Do you complain that Saturday morning cartoons aren’t made for 50 year olds too?
Are kids not allowed the stuff you had? Everything has to be made for whatever age you are at the time? You are the only person who matters and the world must cater specifically for you, forever? You bought a book from them once, and so they now have a life debt to you like they’re a Wookiee?
I have no sympathy for this position. I’m 51. I started playing D&D when I was 11. I am not bothered in the slightest that D&D has been marketed for teenagers since the 1970s. It was marketed towards me when I was 11. It is now marketed towards other people who are 11. And it is a trivial thing, of no effort, to set the tone of your own game however you want it. It's literally no effort.
Man, 50 year-old men whining "me me me!" when children are allowed to have things is so cringey. 6-year olds think the world revolves around them; grown-ups know better. You're a big boy now. Put your big boy pants on and let the kids have their things. Y'know, like grown-ups do.
(Also “they” never cared about you, “they” don’t care about you now, “they” don’t care about the kids either; you’re clever enough to know this).