Old People Anime

All that comes to mind immediately is Monster, I think he's over 30 anyway. He might be in his 20s.

Middle aged anime characters seems pretty rare, probably because most anime is aimed at young people, either children or young adults. There's no shortage of anime with adult protagonists but they're typically still pretty young and in their 20s.

>>115332
>>115343
there was a thread like this not so long ago.
it has more than a hundred:
https://archive.nyafuu.org/wsr/thread/95117/

if it counts, howls moving castle is about a girl who is cursed to become an old woman for most of the movie

Rakugo.

>>115432
Mouryou no Hako, the first episode isn't about the main character, but the victim so don't let it scare you away.
Kagewani
Mushishi
Lupin III
Gate
The Perfect insider
Monoonoke
Sayonara Zetsubou Sensei
Aoi Bungaku (I don't think any of the protags are under 25 in that)

Master keaton

It's a manga, but there is Strongest Man Kurosawa, which is basically a story about a midlife crisis