octogenarian
US /ˌɑːk.toʊ.dʒəˈner.i.ən/
UK /ˌɑːk.toʊ.dʒəˈner.i.ən/
1.
a person who is between 80 and 89 years old, inclusive.
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My grandmother, an octogenarian, still enjoys gardening.
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The marathon had several octogenarians participating.
1.
of or relating to a person between 80 and 89 years old.
:
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The study focused on the health challenges of the octogenarian population.
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He published his latest book in his octogenarian years.