Mine is 17, has almost no teeth and arthritis that gives him trouble in one leg from time to time and he's much more demanding than he used to be...and even more spoiled, but other than that, he still seems to be holding up pretty well.
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Here one of my vintage cats:
Pansy: 1987 -
She will turn 18 in August, except for some allergies, the vet says she is very healthy. She is small, a little over 5 pounds so people think she is only 1 or 2. She's very active, plays and runs around a lot, loves to holler at 3 AM though. B-)