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New Study Reveals Genetics Plays Major Role in Lifespan Determination

KVIA•Thursday, January 29, 2026 at 7:00 PM•CNN Newsource

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Recent research indicates that genetics may account for over 55% of the differences in human lifespan, significantly higher than previous estimates. This study, published in the journal Science, suggests that while genes play a crucial role, lifestyle choices such as diet and exercise can influence longevity by up to five years. Life expectancy in the U.S. reached a record high of 79 years in 2024, although it dropped during the Covid-19 pandemic. Experts emphasize the importance of healthy habits over products marketed for longevity, highlighting that while genetics set a baseline for lifespan, individuals still have the power to improve their health outcomes through their choices.

Key Details: • Genetics accounts for 55% of lifespan differences, lifestyle choices affect the remaining 45%. • Life expectancy in the U.S. is currently 79 years, with a decline noted during the pandemic. • Healthy habits can extend lifespan by about five years, but genetics sets a limit. • No reliable test currently predicts genetic age; developing such a tool could enhance lifespan. • Focus on quality of life is as important as extending years lived.

health research genetics lifestyle longevity

People & Organizations

Johns Hopkins UniversityDeborah KadoUri AlonDan ArkingStanford Longevity CenterWeizmann Institute of Science

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