Hello guys can you recommend me some good yaoi that the uke is a kid and the seme is older...

http://www.mangago.zone/read-manga/pet_oshigotochuu/
http://www.mangago.zone/read-manga/harapeko_usagi_to_koisuru_ookami/
http://www.mangago.zone/read-manga/koi_wa_keiyaku_no_atode/ first story
http://www.mangago.zone/read-manga/s_friend/
http://www.mangago.zone/read-manga/jinsei_wa_barairo_da/
http://www.mangago.zone/read-manga/kawaii_hito_cute/
http://www.mangago.zone/read-manga/heart_no_kakurega/ first story
http://www.mangago.zone/read-manga/toiki_yori_mo_yasashii/
http://www.mangago.zone/read-manga/open_air/
http://www.mangago.zone/read-manga/love_me_hard/

or did you mean shota?
http://www.mangago.zone/home/mangalist/7473/

http://www.mangago.zone/read-manga/super_lovers/
http://www.mangago.zone/read-manga/tenshi_no_heart_rhythm/
http://www.mangago.zone/read-manga/ai_no_houritsu/

http://www.mangago.zone/home/mangalist/45632/

I personally recommend Kokoro and Yume Musubi, Koi Musubi!