The country with the highest life expectancy in 2025 is Monaco, with an average life expectancy of 86.5 years. Monaco's high life expectancy is attributed to its world-class healthcare system, strong education, access to quality Mediterranean food, clean water, low pollution, and an active lifestyle encouraged by its environment.

Other top countries with high life expectancy include:

• San Marino: 85.8 years
• Hong Kong: 85.6 years
• Japan: 84.8 years
• South Korea: 84.4 years

These countries share factors like advanced healthcare, healthy diets, physical activity, and good living conditions that contribute to their populations' longevity.