Blue Buffalo Co. Longevity canned cat food for mature cats. My cat, whose name is Sugar, could not do without this food! She starts meowing for her can first thing in the morning. My cat has kidney issues and has problems processing regular cat food, which had too many unnecessary proteins. I had her on a prescription diet before I started feeding her the Blue Buffalo. She really did not like the prescription food and would walk away without even finishing her plate. With the Blue Buffalo Longevity, she starts eating right away and does not leave a bit of it behind on her plate. Sugar is 13 years old and still leaps and runs around like a kitten! She loves to play with all sorts of toys and really acts like a cat half her age. The vets are amazed when I tell them how old she is. I definitely attribute this to her food which helps to promote her immune system, the health of her joints and her beautiful long silky coat. Blue Buffalo Longevity Mature contains no corn, wheat or soy which she would have a problem digesting. If anyone has an older cat with or without digestive problems, this is definitely a food I would recommend.