The Collaborative International Dictionary
Octogenary
Octogenary \Oc*tog"e*na*ry\, a. [L. octogenarius, from octogeni
eighty each, octoginta eighty, fr. octo eight. See Eight,
Eighty.]
Of eighty years of age. ``Being then octogenary.''
--Aubrey.
Wiktionary
octogenary
a. (context obsolete English) Of eighty years of age.