To date, reliable information on the lifespans of domestic cats is varied and relatively scant. Nevertheless, a number of studies have investigated the matter and have come up with noteworthy estimates. Estimates of mean lifespan in these studies range between 13 and 17 years, with a single value in the neighborhood of 15 years. At least one study found a median lifespan value of 14 years and a corresponding interquartile range of 9 to 17 years. Maximum lifespan has been estimated at values ranging from 22 to 30 years although there have been claims of cats dying at ages greater than 30 years. According to the 2010 edition of the Guinness World Records, the oldest cat ever recorded was Creme Puff, who died in 2005, aged 38 years, 3 days. Female cats have been evidenced to outlive male cats, while neutered cats and crossbred cats have been evidenced to outlive entire and purebred cats, respectively. It has also been found that the greater a cat's weight, the lower its life expectancy on average.
The life expectancy of a cat that is living indoors is typically 15.1 years. In one study of cat mortality, the most frequent causes were trauma (12.2%), renal disorder (12.1%), non-specific illness (11.2%), neoplasia (10.8%) and mass lesion disorders (10.2%).
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