I just don't think you are unable to cast a 20something with gravitas and wisdom, it's acting. The girl who they got playing Nynaeve has it in spades for one, despite looking more like a Seanchan than anything. She instantly fits in her role.Yeah but it's hard to cast women like that, and the CGI is already dumb enough to try and make it work in a fake way. Honestly I don't really mind that and the strangely diverse casting choice is whatever.
You see the thing about the diverse casting, while it is cringey, so long as the characters are behaving the way they should I don't really mind that. Nowhere in the books did Jordan say his world is whtie as fuck and claim the brownish people are nothing but savages who want nothing but violence.....oh...yea he did..nevermind.
Anyway it's fine. There are far worse shows out there that obviously only exist to push how awesome gay diversity is (looking at you Batwoman) and while the Wheel of Time isn't great....it's not a bad show either and the source material it is trying to pull from is dry as fuck, so I don't really see how it can be done much better tbh.
I think this is one of those things where they believed audiences are not willing to see wisdom in someone youthful so to communicate it better they made em all older.
See now you've said that I kind of see that as another diversity check point, "We have older women in our show they don't normally see representation"
I mean, there's roles for old aunties too in the story, it's just not the Aes Sedai specifically. If anything it's prolly more marketing-related cause a lot of the female audience who actually read the books back in the early 90s would be in that demographic themselves so they figured they'd appeal to them.
But yeah I say all that but I seriously enjoy the show and am just glad it exists so I can overlook some differences here and there. I do actually like Moiraine's actress a ton too, most of the issues are more superficial than central.
My main issue is they start with Liandrin and I pictured her like a young Angelina Jolie (prolly due to maleficent) and not her cranky aunt XD.