Why should kids and teens be the only ones who go to magical worlds? Are there any books in the Isekai/travel to another world genre for adults?

I was bummed by how the game Forspoken flopped but it got me thinking "why don't adults get whisked to far off lands and go on grand adventures?"

so here I am asking for that, I'm a big fan of the world hopping in the Chronicles of Amber (seriously I'll read anything by Zelazny) and Chris Ruocchio is my favorite (living) writer atm, and I also enjoy the Pantheon Series by James Lovegrove (Love love love mythology)