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Now he’s back with his head and sense of humor firmly intact with a special that explores gerontology and the U.S.

Olshansky, who specializes in demographics and gerontology, warned that while many people see the term "disabled" as neutral, there is still a risk of it being unintentionally pejorative and stigmatizing.

Prejudice against older adults is nothing new, but “it feels more intense, more hostile” now than previously, said Karl Pillemer, 69, a professor of psychology and gerontology at Cornell University.

Valter Longo, professor of gerontology and biological sciences at the University of Southern California, said taking a large amount of supplements risked adverse interactions.

“As people get older, they need more sleep rather than less,” said Dr. Alison Moore, a professor of medicine and the chief of geriatrics, gerontology and palliative care at the University of California, San Diego.