Studies suggest that genetics may play a significant role in determining human lifespan, with some research indicating that genes could influence up to 55% of lifespan variation. The extent to which genes contribute to lifespan is still being explored, but findings imply that genetic factors may have a greater impact than previously thought. The percentage of lifespan attributed to genetics varies slightly across reports, with one study suggesting it could account for around 50% of human lifespan variation.