A drug called rapamycin helped mice live longer - males lived about 9% longer and females lived about 14% longer when they started taking the drug in late adulthood.
Evidence from Studies
Supporting (1)
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Rapamycin fed late in life extends lifespan in genetically heterogeneous mice
The study fed rapamycin to mice starting at 600 days old and found it extended lifespan by 14% for females and 9% for males - exactly matching the claim. This was done in genetically heterogeneous mice and is described as the first pharmacological extension of mammalian lifespan.
Contradicting (1)
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Transient and late-life rapamycin for healthspan extension
The study tests rapamycin like the claim says, but the abstract doesn't give the specific lifespan extension numbers (9% for males, 14% for females) or confirm exactly when treatment started. It's about the same idea but doesn't provide the evidence needed to prove the exact claim.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.