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In fact, there are a number of creatures with life spans that make the oldest living human seem like a spring chicken in comparison. Here's our list of the 10 animals with the longest life spans  and there's even an immortal animal. CREDIT: limowreck666/Flickr. Geoducks. First on the list are these large saltwater clams that are native to the Puget Sound and have been known to live for at least 160 years.
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.