Yaoi where the couple have almost or the same age?

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

almost the same height:
http://www.mangago.me/read-manga/ameiro_paradox/
http://www.mangago.me/read-manga/kuroneko_kareshi_no_asobikata/ (this series)
http://www.mangago.me/read-manga/kimi_wo_mukaeni/
http://www.mangago.me/read-manga/nights/
http://www.mangago.me/read-manga/t_x_s/
http://www.mangago.me/read-manga/puchitto_hajiketa/
http://www.mangago.me/read-manga/kanga_na_spoon/
http://www.mangago.me/read-manga/mazu_wa_ubaiai/
http://www.mangago.me/read-manga/parallel_lines/
http://www.mangago.me/read-manga/kakko_warukute_kakkoii_kimi/ (slightly shorter seme)
http://www.mangago.me/read-manga/renai_kyoutei_nukegake_nashi/)
http://www.mangago.me/read-manga/blue_sky_complex/
http://www.mangago.me/read-manga/castle_mango/
http://www.mangago.me/read-manga/shisei_gokumon/
for same age maybe try my childhood friend list (most of them are of the same age):
http://www.mangago.me/home/mangalist/11979/

http://www.mangago.me/read-manga/momoiro_junjou_danshi/
http://www.mangago.me/read-manga/momoiro_renai_jijou/