👯 Having identical twins vs 🎂 Living to 100
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You're 2.50× more likely to live to 100
than to have identical twins
Periods differ: Living to 100 is framed as lifetime (approx. US birth cohort), while Having identical twins is per birth (natural, approx.). The multiplier is a raw ratio of the 1-in-X figures — not a normalized lifetime risk. Compare cautiously.
Having identical twins
1 in 250
per birth (natural, approx.)
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 2.50× 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 2.50× more likely to live to 100 (1 in 100, lifetime (approx. US birth cohort)) than to have identical twins (1 in 250, per birth (natural, approx.)). ⚠️ Periods differ (lifetime (approx. US birth cohort) vs per birth (natural, approx.)) — compare cautiously. — How Likely Is That? https://www.howlikelyisthat.com/compare/odds-of-having-identical-twins-vs-odds-of-living-to-100
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