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It’s aimed at children, that’s what shonen anime is, the word literally means “boy”. For something aimed at an older demographic, you’ll want to search seinen. Consider “Monster”, which is something that could’ve been a western show for adults.
https://en.wikipedia.org/wiki/Gravity_Falls
Back to the seinen anime, Monster fits into the category of mystery/thriller. For science fiction/horror see Parasyte -the maxim- and for dark fantasy see Berserk.
https://en.wikipedia.org/wiki/Parasyte
https://en.wikipedia.org/wiki/Berserk_(manga)
Berserk in particular is a staple. It has influenced lots of other work.
https://en.wikipedia.org/wiki/Berserk_(manga)#Legacy
Be sure to not watch the 2016 anime series, as it is reviled for its poor animation. The 1997 anime series or the film trilogy from 2012 are a better use of your time. Both cover the same section of the story. However, be forewarned the part they adapt is a specific arc of the story near the beginning and is thus unfinished. Still worth it.
But I’d still recommend you start with Monster if you’re looking for something closer to live-action shows.
Yeah, this is one thing that I didn't like about AoT, especially in the first 4-5 episodes. Later I accepted it as its characteristic style, I think its strengths greatly overweigh this particular aspect. And, there is much more depth to the characters than the childish dialogs lead you to believe.
Exceptions exist, but the average level of plot / characterization / dialog is terrible by adult standards.
Maybe I am just juvenile in my tastes. I just can't find a western series (and nowadays not even movies) that does the same for me.
Yeah, it hits different when you start at 35.
Unfortunately still I've never really found any that worked for me as complete works of art for all the common reasons. Bad dialog and plotting, off-putting tropes, juvenile subject matter etc.
Dungeon Meshi is also really good from beginning to end. Especially if you like D&D inspired material. It has a clever take on fantasy settings and avoids the more annoying anime tropes.
Like what? This is like saying the aesthetics of Hollywood films just does nothing for me. Which can be Forrest Gump and the Avengers Endgame too