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There are corals known to live for thousands of years, and bowhead whales are estimated to live for centuries, but land animals rarely have such lengthy life spans. The current record holder for the longest currently living terrestrial animal goes to a tortoise named Jonathan.
Life expectancy is how long an organism is expected to live. Typically, the life expectancy of an animal increases with size. For example, cows usually live longer than sheep. The life expectancy of sheep is similar to large breeds of dogs, about 10 to 12 years. Some breeds are known for being longer-lived, e.g. Merino. According to the Guiness Book of World Records, the oldest sheep lived to be 23.