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" The antithetical or perhaps mirror image to sadness is the experience, similarly unique to one's late years, of a swift, mysterious wave of happiness, also causeless, but of much shorter duration. I cannot remember a time, before my sixties, when the consciousness of happiness would sweep over me and, like a shower of cold water when one is desperately overheated, offer me a passing sensation very close to glee.
Both sadness and fleeting happiness relate, I think, to mortality, to the consciousness of being old and of nearing the end of life. . . these sensations . . . surge up from the unconscious, to be a gift of long life or fortunate old age. Both sadness and happiness, but sadness more, are related to the fact that nothing of all this will endure for long. [p. 179] "
― Carolyn G. Heilbrun , The Last Gift of Time: Life Beyond Sixty