Columbia subject headings:
Harvard subject headings:
Aging--Philosophy.
Gerontology--Philosophy.
Hufeland, Christoph Wilhelm, 1762-1836.
Kant, Immanuel, 1724-1804
Philosophy of life.
Princeton subject headings:
Health--Philosophy.
Hufeland, Christoph Wilhelm, 1762-1836.
Kant, Immanuel, 1724-1804.
Longevity.