Having a pet put down is difficult; at least, I remember what it was like having to put down Jet, and I'm not sure I'll ever stop second-guessing our decision. Then again, he wasn't quite as old or as sickly as Aje, and in both instances, it's like you say here: it comes down to quality of life.

She was a good cat. And I know we're all going to miss her. And I know I've said this many times for many different things, but if you need anything at all, don't hesitate to ask. Or poke me on AIM, or throw a thing at my head, or anything. I'm not entirely sure I'm getting across the sentiment I want to, here, but at the very least: *headbomp* <3