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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.
Best Answer: As some have said before 2 to 3 years is average but I have had two live much longer one to 5 and the other to 8 years. Rats are prone to cancer and kidney failure. She may just be at the end of her life but it sounds more like she has an underlaying health problem as well.