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For the time being though we have the first isekai I’ve seen with the protagonist pushing middle age: Kamitachi ni Hirowareta Otoko.
Ryouma Takebayashi is a 39 year old salaryman working for an exploitative company and experiencing the generally garbage life of a pre-isekaid isekai protagonist, when suddenly he dies of a heart attack. Some gods in the afterlife decide to send him to a generic dragon-quest-esque fantasy world for reasons I can’t remember - probably something to the effect of “you were loser Japanese guy who died unexpectedly and that’s just what we do with your kind”. Now as a newly reincarnated 8-year-old with all the memories of his old life, Ryouma proceeds to sit on his butt in a forest and do jack-all for three years. Well actually he trains a bunch of slimes, because isekai shows always seem to require some sort of gimmick to let them say, “see it’s not completely a generic isekai show!”, though I feel like this gimmick is one-upped by that other isekai where the guy actually becomes a slime. In any case a few years later some locals find Ryouma living as a child hermit and invite him back to their town where he continues his current lifestyle of doing jack-all.
Now as other reviews point out, the low stakes and slow pace are certainly intentional: the show is a combination of the isekai and iyashi genres – the two ultimates of otaku escapist fantasies. It’s supposed to be a nice charming slice-of-life about a jaded man experiencing a wonderful magical world in juxtaposition to his terrible previous life. And to be honest I have nothing against either genre in principle – I enjoy shows like Konosuba and Non Non Biyori. However the key component those shows have that Kamitachi ni Hirowareta Otoko lacks is characters that are fun to watch. Kazuma, Megumin, Aqua, and Darkness may not be particularly complex characters, but they are at least distinct and play off each other well.