One of the mysteries of the English language finally explained.
The state or fact of being an octogenarian. rare.
Late 17th century (in an earlier sense). From classical Latin octōgēnārius containing eighty, aged eighty, in post-classical Latin also used as noun denoting a person aged eighty from octōgēnī eighty each (from octōgintā eighty (from octo eight + -gintā, suffix forming cardinal numerals from thirty to ninety, related to decem ten: see decem-) + -ēnī, suffix forming distributive adjectives, after e.g. sēnī six apiece, six at a time, six) + -ārius. Compare Middle French, French octogénaire,, Italian ottogenario, † octuagenario, Spanish octogenario.
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