As scientists search for the secrets behind exceptional longevity, one question keeps resurfacing: how much of our lifespan is shaped by the genes we inherit, and how much by the environments we move through?
A new twins study is helping to sharpen that picture, offering fresh insight into why one sibling might reach 100 while another dies decades earlier.
By separating genetic influence from the shifting risks of accidents, infections, and other external causes of death, researchers are reframing the classic nature‑versus‑nurture debate — and revealing that our DNA may play a far larger role in longevity than previously thought.
