That sounds too much like a letter that the mailman forgets to deliver.
Huh. I wonder if that's what drove the undead nasties in my world. They certainly didn't seem happy. Granted, I wouldn't be in their position either, I like having skin. It's useful stuff.
Right, back to the point. Not aging would make most people happy, whereas getting older makes a lot of them more angry and despairing, so...
You know what? I think I'm going to just write this one off as it's a mystery and leave it at that.