adjective Also, octogenary [ok-toj-uh-ner-ee] .
of the age of 80 years.
between 80 and 90 years old.
a person who is between 80 and 90 years old.

1805–15; < Latin octōgēnāri(us) comprising eighty, eighty years old (equivalent to octōgēn(ī) eighty each + -ārius -ary) + -an

octogenarianism, noun
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World English Dictionary
octogenarian or (less commonly) octogenary (ˌɒktəʊdʒɪˈnɛərɪən, ɒkˈtɒdʒɪnərɪ)
n , pl -narians, -naries
1.  a person who is from 80 to 89 years old
2.  of or relating to an octogenarian
[C19: from Latin octōgēnārius containing eighty, from octōgēnī eighty each]
octogenary or (less commonly) octogenary
[C19: from Latin octōgēnārius containing eighty, from octōgēnī eighty each]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1815, from Fr. octogénaire "aged 80," from L. octogenarius "containing eighty," from octogen "eighty each," from octoginta "eighty," from octo "eight."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

octogenarian oc·to·ge·nar·i·an (ŏk'tə-jə-nâr'ē-ən)
Being between 80 and 90 years of age. n.
A person between 80 and 90 years of age.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
And it is not clear what his supporters here think the octogenarian king can do to rebuild this shattered nation.
The stylish octogenarian is, by his own account, as busy as ever.
He eventually married, published a book of riddles, kept inventing and died an octogenarian.
Sprightly, white-haired musical-theater octogenarian.
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