One of the hardest things about Stash dying was how sudden and mysterious it was. I think about that she was eight years old, not that old for a cat, she could have easily lived twice that long. It's hard to keep it in perspective and remember to appreciate the years she had, when I can quite reasonably say that she could have had just as many all over again, if "whatever" poisoned her hadn't come along.
But yes, let's have some perspective. Eight years or sixteen years, it's not even a blink in the history of life on Earth. Uncountable trillions of possible cats were never even born, and yet I was astronomically lucky to be able to spend just a little time with this one astronomically lucky cat. One blink of an eye or two, the important thing is that she lived at all, and that she was with a family who loved her, and that I got to know her.