Read previewHarvard researcher Dr. David Sinclair has found himself at the center of controversy within the longevity community. He's also earned his share of critics who say his research isn't always backed up by sufficient evidence. Animal Biosciences reissued a press release walking back the "reverse aging" claim. But scientists in the field say the issue is even more fundamental: There's no way to reverse aging, much less measure it. That means debates about the semantics of aging will only become more relevant to our daily lives.

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Persons: —, David Sinclair, Sinclair, He's, Dr, Nir Barzilai, Matt Kaeberlein —, Matt Kaeberlein, Barzilai, it's, it'll, Andrea Maier, Jeff Bezos, Peter Thiel Organizations: Service, Business, Street Journal, Animal Biosciences, Newsweek, The Academy for Health, Academy for Health, Academy, National Institute, Aging, MIT Technology, National University of Singapore, Longevity