I think there's a lot of things like this.

Form of Sympathy

or try to find any here https://www.mangago.zone/home/mangalist/290576/

https://www.mangago.zone/read-manga/jonah_and_chang_il/

https://www.mangago.zone/read-manga/shota_oni/

Thanks y'all!!

A bonus one that you might not actually like and not the one you're looking for.... But has a really huge age gap lolol

https://www.mangago.zone/read-manga/suki_ni_nacchau_yo/

Thank you!!!

https://www.mangago.zone/read-manga/eat_me_up_my_husband/

SUGAR DADDY || age gap
http://www.mangago.zone/home/mangalist/831527/?filter=link
list is a collection of
 • older seme
 • older uke

Follow to be updated. And if you liked the mangas/manhwas I included, please do recommend. Enjoy~ (人 •ᴗ•)

Here older uke x younger seme-
https://www.mangago.zone/home/mangalist/1787219/

https://www.mangago.zone/read-manga/torotoro_hitou_de_koi_hajimaru/

Thanks y'all!!