Responses
Liebling! Is the only one with a beard I can think of.
My old man list
https://www.mangago.me/home/mangalist/2558323/
For both being middle ageish (pretty sure there's more on the list, these are just the ones I thought of)
Eiffel Tower at Sunset
40 x 40 Chikuwa Kaigi
Don't Call Me Daddy
Twilight Cure Important
It Can't Be Mutual Love!! And the sequel Shiba to Tokizou: Diet-Hen
like not just some 5 o clock shadow or a stubble, like a full on beard or something. but it can also be both seme and uke are middle-aged or older