https://www.mangago.zone/read-manga/ojiichan_shinanai/
https://www.mangago.zone/read-manga/gojuu_rokujuu_yorokonde/
https://www.mangago.zone/read-manga/koi_ga_ochitara/
https://www.mangago.zone/read-manga/midnight_rain_ctk/
https://www.mangago.zone/read-manga/itooshiki_hibi/
https://www.mangago.zone/read-manga/reemployment_life_with_an_unsociable_untalkative_magician/
https://www.mangago.zone/read-manga/mitsuya_sensei_no_keikakuteki_na_edzuke/
https://www.mangago.zone/read-manga/sesame_salt_and_pudding/
There’s Ojisama to neko
https://www.mangago.zone/read-manga/ojisama_to_neko/
Wholesome Old Couple, Established Relationship
https://www.mangago.zone/read-manga/itooshiki_hibi/
https://www.mangago.zone/read-manga/joou_to_shitateya/ (Hot & Sexy Older Uke)
Koi Ga Ochitara (Older Seme, very mature, green flag, and HOT )
https://www.mangago.zone/read-manga/koi_ga_ochitara/
Sequel from Koi Ga Ochitara
https://www.mangago.zone/read-manga/koi_ga_michitara/
Hot, Tough, & Sexy older Uke
https://www.mangago.zone/read-manga/on_doorstep/
Damn i was gonna link this
Hot old men?
Can be BL (both are old) or straight or even a father-daugther story thing
Ref: https://www.mangago.zone/read-manga/i_woke_up_in_a_fantasy_world_as_a_young_lady_and_fell_in_love_with_my_ex_fianc_s_grandfather/