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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).
Part of the reason researchers are so interested in dinosaur life spans is that modern-day reptiles are some of the longest-lived animals on the earth: giant tortoises can live for over 150 years, and even crocodiles and alligators can survive well into their sixties and seventies.