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What country has the oldest age expectancy?

According to the CIA World Factbook and other sources, the Principality of Monaco has the oldest age expectancy, or life expectancy, in the world, with residents living an average of 89.8 years as of a 2024 estimate. This tiny, wealthy European city-state surpasses other high-ranking nations like Japan, Singapore, and Switzerland in average lifespan. Several key factors contribute to this impressive longevity, including its high standard of living, exceptional healthcare system, and healthy Mediterranean lifestyle.