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Genetics Now Account for 55% of Lifespan Variation

1/30/2026

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Summary

Story summary

The Weizmann Institute of Science, led by Ben Shenhar, reports genetics account for about 55% of human lifespan variation, up from 20–25% in earlier estimates.
Researchers used twin and sibling data to isolate intrinsic mortality factors, such as age-related diseases, while excluding extrinsic causes like accidents and infections.
Experts caution that lifestyle choices still significantly shape life expectancy, contributing about 45%.

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Story summary

The Weizmann Institute of Science, led by Ben Shenhar, reports genetics account for about 55% of human lifespan variation, up from 20–25% in earlier estimates.
Researchers used twin and sibling data to isolate intrinsic mortality factors, such as age-related diseases, while excluding extrinsic causes like accidents and infections.
Experts caution that lifestyle choices still significantly shape life expectancy, contributing about 45%.