📅 Being born on leap day vs 🎂 Living to 100
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You're 14.6× more likely to live to 100
than to be born on leap day
Periods differ: Living to 100 is framed as lifetime (approx. US birth cohort), while Being born on leap day is per birth (calendar). The multiplier is a raw ratio of the 1-in-X figures — not a normalized lifetime risk. Compare cautiously.
Being born on leap day
1 in 1,461
per birth (calendar)
Living to 100
1 in 100
lifetime (approx. US birth cohort)
How we calculated this
Each figure is “1 in X.” The larger X is the rarer event. Dividing that number by the more common one gives the multiplier: you're 14.6× more likely to live to 100. When the periods differ, this is a raw ratio of those figures, not a lifetime-normalized risk.
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You're 14.6× more likely to live to 100 (1 in 100, lifetime (approx. US birth cohort)) than to be born on leap day (1 in 1,461, per birth (calendar)). ⚠️ Periods differ (lifetime (approx. US birth cohort) vs per birth (calendar)) — compare cautiously. — How Likely Is That? https://www.howlikelyisthat.com/compare/odds-of-being-born-on-leap-day-vs-odds-of-living-to-100
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