My cat passed on day before yesterday. He was 14 years old.
He wasn't much more than a scrap of fur and bone at this point (hard to tell in the pic, darn long-haired cats).
He had lost a lot of weight, so we took him to the vet who took an x-ray to find a suspicious mass filling 1/4 of his abdominal cavity.
He was my oldest living baby (and longest lived pet) and I miss him. So does my 8-year-old son(also in the pic).