Anyone know any romance with young kid falls INLOVE with older female?

You mean shotacon (=・ω・=)

http://www.mangago.zone/read-manga/the_tyrant_s_guardian_is_an_evil_witch/

idk if this counts but this girl is human and this other guy is a dragon and hes like 500 years old while the girl is like 11 or something http://www.mangago.zone/read-manga/i_was_born_as_the_demon_lord_s_daughter/

manga: http://www.mangago.zone/read-manga/yankee_boy_and_otaku_girl/
http://www.mangago.zone/read-manga/yakumo_san_wa_edzuke_ga_shitai/

manhwa: http://www.mangago.zone/read-manga/summer_solstice_point/