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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.
Lifespan Records of Pet Rats: How Old Was the Oldest Pet Rat That Ever Lived? Currently, there is a jaw dropping record for the longest lived pet fancy rat in history, that dates to 1995. A laboratory rat who was named Rodney lived to the ripe old age of 7 years and 4 months; is that unbelieveable or what?? He almost tripled his expected lifespan!