Both of our cats were rescue cats. One lived for 10 years before succumbing to thyroid problems. The other is still with us at 20 but needs daily medication. It was 18 months before cat 2 would sit on our laps, because she'd been found living wild. She is now a confirmed lap cat but still likes the outdoor life. Our last vet's bill for a couple of urine tests was over £100. Our vet says the oldest cat he's ever dealt with was 24, so when you consider an 'older' cat you might want to bear in mind its age in the context of likely medical needs and the cost of pet insurance, which we don't have. However much longer Cat 2 lives, she will have had a far better life than if she'd remained feral, and she's like a family member to us. It's been a pleasure to know her.