Aging is not a disease but a biological process — one that is more plastic, more influenced by daily choices, and more variable across individuals than was understood a generation ago. The science of longevity now identifies consistent contributors: vigorous movement, strong social connection, adequate sleep, dietary patterns close to whole foods, and a sustained sense of meaning and purpose. Living long matters less than living well into late life, and the habits that support the latter usually also produce the former.
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