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What country has the highest percentage of old people?

As of recent data, Monaco holds the highest percentage of older adults, with approximately 36.8% of its population aged 65 and above in 2025. While Japan is often cited for its aging society, the tiny city-state on the French Riviera has an even higher concentration of seniors, primarily due to factors like high life expectancy and its attractiveness as a retirement destination. This trend highlights how demographic shifts are impacting both large nations and smaller territories.