Yahoo: Sphynx Cats Have the Lowest Life Expectancy of Domestic Feline Breeds, Study Finds Add Yahoo as a preferred source to see more of our stories on Google. The cat breed lives for an average of 6.7 years after their first year of life as a kitten, researchers said Sphynx cats don't ... Sphynx Cats Have the Lowest Life Expectancy of Domestic Feline Breeds, Study Finds