Which country has the highest life expectancy?

Japan has the world's highest life expectancy at approximately 84.3 years overall (WHO 2023): men 81.5 years, women 87.6 years. Other top countries: Switzerland (83.8), Singapore (83.1), Australia (83.2), South Korea (83.3), Italy (82.3), France (82.3). The US ranks 46th globally at approximately 76.4 years — below most Western European countries and far below Japan.

How much does smoking reduce life expectancy?

Smoking reduces life expectancy by approximately 10 years on average. A 2015 NEJM study found that smokers who quit by age 35 recover nearly all lost years; quitting at 45 recovers 6–7 years; at 55 recovers 4–5 years. These estimates are consistent across US, UK, Australian, and WHO public health research.

Why do Japanese people live so long?

Japan's exceptional longevity is attributed to multiple factors: (1) Traditional diet low in saturated fat and high in fish, vegetables, and soy (especially in Okinawa); (2) Low obesity rates — Japan has one of the world's lowest BMI distributions; (3) Universal healthcare system with strong preventative care; (4) High social cohesion and purpose (ikigai concept); (5) Low smoking rates, especially among women; (6) Active lifestyle maintained into old age. Okinawa was historically a 'Blue Zone' — one of 5 global longevity hotspots studied by Dan Buettner.

🌍 WHO Data 📊 OECD 🇯🇵 Japan #1 12 Countries

Life Expectancy Calculator

Estimate your life expectancy based on your country, lifestyle, and health factors. Japan leads the world at 84.3 years; the US ranks 46th globally at 76.4 years — a 7.9-year gap explained by diet, healthcare, and lifestyle differences.

Quick Answer

World average life expectancy: ~73 years (WHO 2023). Top countries: Japan 84.3, Switzerland 83.8, Australia 83.2, South Korea 83.3. US: 76.4 years (ranks 46th). Smoking cuts ~10 years. Obesity (BMI ≥30) cuts ~3 years. Exercise adds 2–3 years. Significant differences exist by country — driven by diet, healthcare access, and lifestyle patterns.

📊 This is a statistical estimate based on population averages, not a medical prediction. Individual outcomes vary greatly.

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Life Expectancy by Country (WHO / OECD 2023)

Country	Overall	Men	Women
🇯🇵 Japan	84.3	81.5	87.6
🇰🇷 South Korea	83.3	80.5	86.5
🇨🇭 Switzerland / 🇦🇺 Australia	83.2–83.8	81–81.3	85–85.2
🇨🇦 Canada	82.3	80.2	84.1
🇫🇷 France	82.3	79.2	85.5
🇬🇧 United Kingdom	81.0	79.0	82.9
🇩🇪 Germany	81.1	78.6	83.4
🇺🇸 United States	76.4	73.5	79.3
🇧🇷 Brazil	75.9	72.8	79.4
🇨🇳 China	77.4	74.7	80.5
🇲🇽 Mexico	75.0	72.1	78.1
🇮🇳 India	70.8	68.4	71.8

Source: WHO Global Health Observatory, OECD Health Statistics 2023. Values are approximate at birth.

Frequently Asked Questions

Why does the US have lower life expectancy than other wealthy countries? ▾

The US life expectancy gap (76.4 years vs 83+ in Japan, Australia, and most of Western Europe) is attributed to several factors: (1) Higher rates of obesity (42% obese vs 4% in Japan); (2) Higher drug overdose and firearms mortality; (3) Higher road traffic fatalities; (4) Lack of universal healthcare access; (5) Higher income inequality than peer nations. These factors are documented in OECD and Commonwealth Fund comparative health system analyses.

Does exercise really extend lifespan? ▾

Yes. Multiple large studies consistently show that regular physical activity adds 2–5 years to life expectancy. A 2012 study in PLOS Medicine (Wen et al.) found 15 minutes of daily moderate exercise reduced mortality by 14%. The WHO, NHS, and CDC all recommend 150+ minutes of moderate activity per week as a core longevity intervention. Exercise benefits are dose-dependent up to about 300 minutes/week, after which additional benefit plateaus.