New Study Doubles Lifespan Heritability Estimate

A new study published in Science by researchers from the Weizmann Institute of Science, led by Ben Shenhar and Uri Alon, suggests that genetic factors contribute approximately 50-55% to human lifespan, significantly higher than previous estimates of 10-25%. The study re-examined historical twin data from Sweden, Denmark, and the United States, accounting for 'extrinsic mortality' (deaths from external factors like accidents or infectious diseases) that had skewed earlier findings. By mathematically separating these factors, the researchers found a clearer genetic signal, validating the importance of genetic research in longevity. This discovery challenges the prevalent view that lifestyle and environmental factors are the primary determinants of lifespan and could encourage more investment and research into the genetics of aging, potentially leading to new medical interventions.