Sumako and I decided to not have any more pets after those we have now. Our adopted family numbers about 30 now -- indoor, outdoor, in-out, and "peripherals". Those are the lost souls who show up regularly for food and meds, but are not quite domesticated. As long as they don't fight with the others, they are welcome. We nearly never see cat-fights here since there is plenty of food and space.
Ours seem to outlive most others here because they get great care. But we're getting too old to consider keeping young cats that might outlive us...!
We don't really regard them as "pets", either. At some point, they become family. But I don't think we are up to raising kids anymore. Our last to come is Siren, a small black kitty who at only 10 months old was already pregnant. I think she was dropped off on our porch late one night 3 years ago by someone who didn't want her and her kittens (I awoke at 3am to her screams). Sadly, she lost her one kitten at birth, and she never grew much larger than kitten-size herself. Her voice sounds like a police siren, hence her name.
She is our last.
We are just getting too old to host any more than we have...