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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.
Lifespans of Fancy Rats. The common pet rat wonât be as long lived as many of our favorite pet species. This can deter new owners, as it is shocking to realize that pet rats will only live for 2-3 years on average. Usually, they live for 2.5 years, or 30 months. Yes, THIRTY months. Thatâs a really short lifespan for rats, as amazing of pets as they are.