The animal known to have a long lifespan, sometimes living over a century, is the green sea turtle. These marine reptiles can live for 80 years or more, with some individuals reportedly reaching ages exceeding 100 years. Their long lifespan is attributed to a slow growth rate and prolonged maturity, which can take 20 to 50 years before they reach reproductive age. Green sea turtles are primarily herbivorous, feeding on seagrasses and algae, and they play a vital role in maintaining the health of marine ecosystems. Conservation efforts are critical in protecting their habitats and ensuring their survival.