Other forms: octogenarians
An octogenarian is somebody between eighty and ninety years old. A sprightly octogenarian, octogenarians and older, still working as an octogenarian.
The whole family of these words counts by decade, so a nonagenarian is in the nineties and a centenarian has reached a hundred. There is no ordinary word for the seventies apart from septuagenarian, which almost nobody uses.
1nounoctogenarianSomebody between eighty and ninety years old.
“The octogenarian still swims in the sea every morning, even in winter.”
octogenarian is a person.
Latin octogenarius means containing eighty, from octoginta, eighty.
French
octogénaire
Latin
octōgēnārius
English, today
octogenarian
Built from
From Latin octōgēnārius + -an, either directly or via French octogénaire, from Latin octōgēnus (“80 each”) + -ārius (“-ary”), from octōgintā (“eight tens, 80”).
Etymology from Wiktionary, CC BY-SA