Manga Yaoi: BrotherxBrother, Age gap

Brothers:
http://www.mangago.me/read-manga/momoiro_shoukougun/

http://www.mangago.me/read-manga/charao_kun_to_haraguro_kun_no_himitsu/

http://www.mangago.me/read-manga/netsuai_naono_bohra/

http://www.mangago.me/read-manga/amai_sokubaku/

http://www.mangago.me/read-manga/into_your_heart_through_the_door/

http://www.mangago.me/read-manga/bomb_heaven/

http://www.mangago.me/read-manga/camellia_minami/

My favorite with age gap (uke 18, seme 33):
http://www.mangago.me/read-manga/kokoro_kanda_neko/

I agree. This is the best.

Naono Bohra-sensei's works has couples with age gaps, you should try them out.

Younger Seme/Older Uke:
http://www.mangago.me/read-manga/toshishita_no_kare_no_kare/

http://www.mangago.me/read-manga/m_no_retsujou/

http://www.mangago.me/read-manga/hatsujou/

http://www.mangago.me/read-manga/perfect_kareshi/

http://www.mangago.me/read-manga/boku_no_mama_chan_43_kaihatsu_nikki/

http://www.mangago.me/read-manga/mujikaku_love_factor/

http://www.mangago.me/read-manga/do_do_do_s_kyuu_kareshi/

http://www.mangago.me/read-manga/sensei_wa_sonna_koto_oshietenai/

http://www.mangago.me/read-manga/sayonara_alpha/

http://www.mangago.me/read-manga/shingeki_no_kyojin_dj_ore_no_alpha/

http://www.mangago.me/read-manga/yorokobi_wa_hiza_no_ue/

http://www.mangago.me/read-manga/melancholy_melancholic_melancholinist/

http://www.mangago.me/read-manga/bouzu_to_kumo_buddhist_priest_spider/

http://www.mangago.me/read-manga/makkurayami_de_kimi_to/

http://www.mangago.me/read-manga/go_houbi_chikubi/

http://www.mangago.me/read-manga/drugless_sex/

http://www.mangago.me/read-manga/tsuki_no_ura_wo_koete_omegaverse/

http://www.mangago.me/read-manga/pretty_wimps/

http://www.mangago.me/read-manga/koi_to_wa_yobenai/

http://www.mangago.me/read-manga/tadaima_renai_kenshuuchuu/

http://www.mangago.me/read-manga/osananajimi_ga_do_m_de_tsundere_nan_desu_ga/

http://www.mangago.me/read-manga/sumanai_masumi_kun/

http://www.mangago.me/read-manga/strawberry_combat/

http://www.mangago.me/read-manga/namida_hanamizu_gusyogusyo_danshi/

http://www.mangago.me/read-manga/itoshii_to_iu_koto/

http://www.mangago.me/read-manga/koi_no_amai_toko/

Brothers:
http://www.mangago.me/read-manga/kabeana_heaven_hole/

http://www.mangago.me/read-manga/3_pun_instant_no_chinmoku/