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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.
I have always had male rats although now I have 3 female rats and am also curious on their age expectancy :) I think your rats should live until they are at least 3 years old, (unless something terrible happens to them) Maybe 4 if your Lucky:). Source(s): long time rat owner :). random Â· 7 years ago.