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flag Genetics account for nearly half of lifespan differences, especially after age 40, new study finds.

flag A new study in Science finds genetics may explain about 50% of human lifespan variation, nearly double previous estimates, as researchers separate intrinsic aging from external causes like accidents and infections. flag Using updated twin data and a new model, scientists show declining extrinsic mortality over time allows genetic factors to play a larger role. flag Intrinsic aging, driven by inherited traits, becomes the dominant influence after age 40, with heart disease and dementia showing higher heritability than cancer. flag While healthy habits still improve health and add about five years, reaching extreme longevity likely depends more on genetics.

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