I think it's absolutely wonderful that you opened your home to a senior cat. I did the same thing last year after my soulmate Beck passed away. He lived to be 18, I had him for 16 years and he was / is my best friend forever. 2 weeks after he died I decided to adopt an older cat. My thought process behind it was - what if Beck had landed a different special person than myself, and what if, when things became difficult that person just gave up on him because he had become old and sick?
I found Cleo on a non-profit organization called ARTS and I applied to adopt. Her previous owners had turned her outside when she became ill. To me she was the perfect match. Her sickness was easily manageable by a daily medication. I had her from February 18th 2019 until March 2nd 2020. And in just a single year she managed to work her way deep into my heart. She was the first pet I have ever euthanized (Beck passed away in my arms at home). After the needle was administered, I held her, and once the vet told me she was gone, I stood there like a fool trying to get her eyes to close, mumbling about how she was still awake. That is when the vet explained that it is common for them not to close their eyes. I too wish that had been explained to me ahead of time. I will continue to adopt seniors, but at the moment the time isn't right for me. I also lost my 13 year girl Sphinx almost a month ago, the pain is just too much and I need to give myself time to heal. I still have one cat that needs me (although lately I think I need him more!) He's 12, almost 13 and he's the main focus of my life.
“Until one has loved an animal, a part of ones soul remains unawakened” ~ Anatole France