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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.
Source(s): Raised gerbils, hamsters, mice, rats, and other little critters. Gerbils, like hamsters and rats, may live for only 2 or 3 years at the most. Gerbils live for slightly longer than say hamsters and as an average can live 3-4 years. However, gerbils are very prone to tumours, many benign, but they can sometimes cause difficulties and therefore can reduce the life expectancy of said gerbie. Have to say slightly confused to find this question in reptiles...