Rapamycin fed late in life extends lifespan in genetically heterogeneous mice

Researchers gave rapamycin, a drug that blocks a cell growth pathway, to genetically mixed mice. The mice started receiving it at about 20 months old, roughly late middle age for a mouse. About 1,900 mice took part, and treated mice lived longer than untreated mice. Average lifespan rose by about 9% in males and 14% in females. The study was in mice, not people, so it does not directly show that rapamycin helps humans live longer.

What this means for you: This is not a reason to buy or take rapamycin for longevity. It is an important animal finding, but human benefits and long-term risks remain uncertain.