Columbia subject headings:
Aging in literature.
Aging--Philosophy.
English poetry--Middle English, 1100-1500--History and criticism.
Middle age in literature.
Middle age--Philosophy.
Perfection in literature.
Perfection.
Philosophy in literature.
Philosophy, Medieval.
Harvard subject headings:
Aging in literature.
Aging--Philosophy.
English poetry--Middle English, 1100-1500--History and criticism
Middle Ages in literature.
Middle age in literature.
Middle age--Philosophy.
Perfection in literature.
Perfection.
Philosophy in literature.
Philosophy, Medieval.
Princeton subject headings:
Aging in literature.
Aging--Philosophy.
English poetry--Middle English, 1100-1500--History and criticism.
Middle age in literature.
Middle age--Philosophy.
Perfection in literature.
Perfection.
Philosophy in literature.
Philosophy, Medieval.