Recommend me some card game animes with the vibe of Yu-Gi-Oh 5D's (individual character arcs, not set in a school environment, the protagonists are not classmates, the protagonists get to know each other throughout the journey, and that have characters of different ages playing from children to adults)
Battle Spirits Shonen Gekiha Dan/Battle Spirits Brave
Card Game Isekai involving mostly a cast of teens but some other varied characters (Brave I think is a bit more age varied and the cast is older), both dealing with war, racism, and horror.
Cardfight!! Vanguard overDress/will+Dress
Was a mix of teenagers and young adults, is mostly about a late night fight club of card gamers who get involved in increasingly strange situations, including a fight with another group and then later a former CIA conspiracy.
Divinez does have classmates but it's definitely kids to adults set in a secret tournament.
So take of that what you will.
The protagonist is an aeons old space warrior who teams up with two kids, most of the journey is about their growth as people, not set in school, goes through time and space.
The main cast is a mix of teenagers and working adults. Only Aoi and Yusaku go to school to each other. School barely factors in. Is not set in a school environment. Is more a digital conspiracy thriller.
Battle Spirits Sword Eyes
A group of 12 chosen heroes of differing age must fight to decide the fate of the world that ultimately becomes a conspiracy against God himself. Much of the journey is learning to understand each other despite being divided between Light and Dark.
Saikyo Ginga Ultimate Zero Battle Spirits
Basically One Piece in Space except they blew all the budget all the rigs of the main character's aces that the villains have basically noone on their side playing. But it is a journey of discovery of differing ages not set in school, in a space ship.
Battle Spirits Double Drive
Two kids (one from a normal world and one from a world where card games are life and death) end up in a world that's slowly dying that's the source of Battle Spirits. I think there's a little kid, plus a sleazy adult thief. They journey on a sand ship to stop the apocalypse.
(I need to watch Duel Masters at some point, in Japanese...)