Aww, so sorry. My mom had both boys put down, Mischief, our big tuxedo, when I was 8, and Moxie, our big tabby, when I was 12. She also had a tabby that died at home when I was a baby. He had a seizure and fell and hit his head.
We got Belle, our only cat now and very delicate female tuxedo, a year after losing Moxie. I take her to the vet yearly for shots and all, but the vet always says the same thing: she's in excellent health and we could get her to 20, or beyond. She's spayed and never had kittens, she's a healthy weight, she doesn't go outside (like, refuses to. We open the door, just for fun, and say "Come on out kitty cat" and she looks at us like we're nuts and walks away) gets plenty of exercise from randomly running around the house, and has no other health issues. She's 7, but certainly doesn't look or act like she's that old. She'll likely come with me when I move out, but at least I know I'll have her for at least another decade.