Big age gap: https://www.mangago.zone/read-manga/the_honest_life_of_a_game_studio/
There are a few generational gap jokes in there, too.
Lip Smoke
https://www.mangago.zone/read-manga/sayonara_alpha/
https://www.mangago.zone/read-manga/kirei_ni_shiteyo/
https://www.mangago.zone/read-manga/namaiki_kareshi/
https://www.mangago.zone/read-manga/lover_boy_lezhin/
https://www.mangago.zone/read-manga/pretty_wimps/
https://www.mangago.zone/read-manga/kitto_oujisama_ga_nante/
https://www.mangago.zone/read-manga/koi_ga_ochitara/
love you all
itadakimasu! ლ(´ڡ`ლ)
i wanna read stories with age gaps and they can be big or small just FEED ME THE LOVE