Recommend me manga with a 25+ years old adult woman as the MC

>>1529169 (OP)
I dunno about a recommendation, but I was able to find this just by searching for "OL"
https://mangadex.org/title/6d216412-2453-451b-91b6-bedfcd9639d4/ol-vtuber-to-oshi-jk-chan
She's 26. Most OL characters are gonna be 25+.
I'm also pretty sure there are some isekai manga about OLs getting reincarnated as younger women, but I dunno if that's your jam.

This'd be easier if you wanted a heroine instead of an MC. In case you did mean heroine, you have this,
https://mangadex.org/title/52697573-3d2b-4487-bb56-272b000bd7e1/are-you-okay-with-a-slightly-older-girlfriend
It was a victim of the MangaDex purge, so you can get the official version here,
https://global.manga-up.com/manga/74
https://comikey.com/comics/are-you-okay-with-a-slightly-older-girlfriend-manga/228/
Or still get the fan TL here,
https://mangafire.to/manga/choppiri-toshiue-demo-kanojo-ni-shite-kuremasu-kaa.zlv1l
https://bato.to/series/115853/are-you-okay-with-a-slightly-older-girlfriend-official

It's worth noting that women 25+ as main characters are typically either going to be in yuri or isekai, since they'd just be the heroine rather than the MC in het stuff.

>>1529169 (OP)
will you stretch to 24 years old?
Kidō Senshi Gundam: Iden Nijūyon-sai Shokugyō OL, Tensei-saki de Kycilia Yattemasu

>>1529169 (OP)
>>1529406
Also there's this, which is from a faceless OL's perspective, but I don't know the OL's age. However it can be assumed she's over 25 since she was working as an office lady at least three years prior to the story happening
https://mangadex.org/title/85eddc87-036c-4c64-8553-8557ad239e48/androgynous-chan-and-the-onee-san

>>1529169 (OP)
Maria no Danzai
Genkai Dokushin Joshi (26) Gohan
Neeko wa Tsurai yo
The Lady Knight and the Beast-Eared Child
My Lesbian Experience with Loneliness

Kine-san no 1-ri de Cinema. OL is secretly a Western movie otaku and runs a review blog.