A groundbreaking study from the Weizmann Institute of Science, published in the journal Science, reveals that genetics play a much larger role in determining human life expectancy than previously believed. The research found that genetic factors account for roughly half of the variation in how long people live, which is at least double the influence earlier studies suggested. This challenges longstanding beliefs that lifestyle and environmental factors are the primary determinants of longevity, highlighting the significant impact of inherited traits. The findings could reshape approaches to aging and health research worldwide.