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Your assumption that humans somehow live longer than most other animals seems to be a misconception. You see, it is not only humans, but most large animals around our size, and larger, which live longer (for example, sea turtles live up to 200 years).
We determine species life spans usually from captive animals because we can track their ages. So, that's how I arrived at the answer--from animals in captivity. The longest-lived captive animal is the giant tortoise (177 years) and the shortest, the gastrotich (3 days). By the way, Forest Preserve District of Cook County presents examples of extreme old age in a nature bulletin (No. 486-A, dated March 24, 1973).