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'At best, Brenner says, scientists can develop therapies that maintain the health of older people and help keep them out of the hospital—an increasingly important goal as the average age in the United States and elsewhere keeps climbing. Brenner is tackling this problem as the chief scientific advisor of a bioscience company called ChromaDex, which markets supplements for “healthy aging.” But believing we can rewrite the operating manual for lifespan itself, Brenner told me, is like “believing in the tooth fairy.”
