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Which country has the longest lifespan in the world?

According to the CIA World Factbook's 2024 estimates, the small European principality of Monaco holds the top spot for the longest lifespan in the world, with a life expectancy at birth of 89.8 years. While Monaco consistently ranks highly, other nations and territories like Singapore, Macau, and Japan also regularly top global longevity lists, showcasing different factors that contribute to a long life.