Please recommend me some bl with younger tops thanks xb

try "Rivalry"

the author of this bl is known for making there tops younger than the bottom

https://www.mangago.zone/read-manga/1_vision_1/

okii these might help~
https://www.mangago.zone/read-manga/eat_me_up_my_husband/
https://www.mangago.zone/read-manga/himono_tokodoki_shanairen_ai/
https://www.mangago.zone/read-manga/runway_hit/
https://www.mangago.zone/read-manga/shoushin_otoko_ni_haru_no_arashi/
https://www.mangago.zone/read-manga/the_dawn_split_the_night_ilovecheetos/
https://www.mangago.zone/read-manga/the_lovesick_flower_buds_waiting_for_spring/