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Wild Rats. In the wild, the life expectancy for a rat is much lower: 95 percent of wild rats die before they reach their first birthday. A 1-year-old rat would be around 30 years old in human terms. The most common cause of death in wild rats comes from predators, such as owls, hawks and foxes.
The many rules of thumb that are available to compare cat ages to human ages are usually based upon total life expectancy. An average catâs life expectancy is around 17 years, and a humanâs is around 84 years. This leads to a rough equivalency of five-to-one. But it is not an apples-to-apples comparison.