Sorry to here about your loss. I had a cat that died at 17 also. We were the same age me and Rebel. Was a gray cat. He used to come to my bed, after calling his name, and give me a back message. Now i have a cat that my wife brought to my house that looks and acts just like him. But i need to train him to do back messages.
Tell us a story about Annie. I find telling stories about the lost ones helps.