In a Word

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macrobian
adj. long-lived

annosity
n. fullness of years, length of life, agedness

Index entries from A. Lapthorn Smith’s How to Be Useful and Happy From Sixty to Ninety, 1922:

Absurdity of voluntary retirement at sixty
Adding ten years to life
Alcohol as cure for insomnia, very bad
All day in garden
Beard, long white, don’t wear
Carriage and pair shortens life
Cause of insomnia must be found
Cook, good, source of danger to elderly men
Crime to die rich
Engine drivers over sixty, what to do with them
Garrett, Mrs., of Penge, active voter at 102
If no relatives, spend on poor
Young people, company of, at sixty, how to keep

See Jonathan Swift’s “Resolutions — When I Come to Be Old.”