Which birth month lives the longest?
Short answer: Multiple population studies find small but consistent associations between month of birth and lifespan; people born in autumn (often September–October in many temperate countries) tend to live slightly longer on average than those born in spring. The differences are modest and vary by place, cohort and study methods.
Explanation
Researchers studying large cohorts have observed that season or month of birth correlates with later-life mortality in some regions. Proposed explanations include early-life environmental exposures (maternal nutrition, infectious disease seasonality, and prenatal vitamin D from sunlight), socioeconomic and cultural patterns that vary by birth timing, and cohort-specific factors. The observed effect sizes are small—typically measured in months to a few years of average life expectancy—and are not deterministic for individuals. Results differ by country, birth year range and analytical approach, so month of birth is a minor statistical factor compared with established lifestyle and healthcare determinants of longevity.
Tips
- Focus on proven longevity factors: regular physical activity and a balanced diet.
- Avoid smoking and limit excessive alcohol intake.
- Maintain healthy weight, control blood pressure, cholesterol and blood sugar.
- Prioritize sleep, stress management and strong social connections.
- Attend regular preventive healthcare and vaccinations across the lifespan.
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