This one is kinda cute too bad it hasnt been updated for a long time ╥﹏╥ http://www.mangago.me/read-manga/negaigoto_wa_hidamari_de/
oyaji x oyaji? i have a fair number of them, it's kind of unique and interesting.
ch 1-2 http://www.mangago.me/read-manga/koi_wo_shimashou/
http://www.mangago.me/read-manga/black_outsider/ (handsome old man seme x ordinary looking old man uke) time travel.
http://www.mangago.me/read-manga/tenshi_no_uta_nishida_higashi/ my fave! widower x single father
look for nishida higashi-sensei. she's the master of oyaji BL stories.
and there's more here. i always specify the kind of pairing, just look around
http://www.mangago.me/people/tag/49344/ossan/?page=1
Haiyoo any yaoi manga where BOTH characters are middle aged or even older?
I something like DNA+ of Ayano but with more development maybe? Thanks