Responses
older bottom, manga, and omegaverse. but bottom is not an "old man" -- https://www.mangago.zone/read-manga/kouguu_no_omega/
guideverse but old man bottom -- https://www.mangago.zone/read-manga/old_wolf_and_young_fox/
bottom is older and manga: https://www.mangago.zone/read-manga/the_affairs_of_the_other_world_depend_on_the_corporate_slave/
old man omegaverse yaoi. older bottom preferred
extra bonus points if it’s manga