Journal of the American Geriatrics Society · 2000 · 475 citations · 28 references
Our results support the concept that positive affect, or emotional well-being, is different from the absence of depression or negative affect. Positive affect seems to protect individuals against physical declines in old age.
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Aging, Natural Death, and the Compression of Morbidity
James F. Fries · New England Journal of Medicine · 1980 · 3.3K citations