Most games anywhere are pretty youthful. A power fantasy about ripping demon heads open, isn't that much different than an italian plumber exploring colorful worlds, in terms of overall maturity. I'd think they were all for kids, teens, and college students, to varying extents.
Even more traditional mediums. Probably the most celebrated TV show in the world right now, is about a big future suit of armor and his puppet son taking on a man with a black laser sword.
It tends to be a matter of how much pretense you add to your immature entertainment of choice.
Of course, there's nothing wrong with this. As long as you don't become a bugman and live in fantasy worlds designed for children all the time, to the point where you base your politics and ideas on them, lol, borrowing that entertainment can be a fun, recharging break from the often dismal reality of an adult.