Okay so I went to the source article and here’s the paragraph where the guy tells his secret:
First, there was their daily diet: on top of dry commercial cat food, a home-cooked breakfast of eggs, turkey bacon, broccoli, coffee with cream, and—every two days—about an eyedropper full of red wine to “circulate the arteries.” Then there was his effort to ensure the cats were sufficiently stimulated: a garage he’d converted into a home movie theater, with a working reel-to-reel projector and actual movie theater seats, where Perry screens nature documentaries exclusively for the cats (with previews, he added). Last, and perhaps most important, he swore that love and close, personal relationships helped his cats live longer. Perry adored his cats so much, he remembered each of their birthdays.
Wolf in Shepherd's Clothing 