I know another yuri series with an older main character: Korean manhwa Love Thy Neighbor. Google-search for it if you want to try.
The 2 women in the main roles are Doyeon, a 20-something college student, and Jinju, a woman of 40 or 50 who looks even older because she's had a tough life : she's been married for 20+ years to a creep who always made things hard for her and in the end he ran away and left her with a shitload of debt. Jinju loses her apartment and Doyeon, who is her next-door neighbor, lets her stay at her place ; and in this way the setting for yuri is established because, as the title says, this story is about loving thy neighbor!