English version

octogenarian

From Longman Dictionary of Contemporary Englishoctogenarianoc‧to‧ge‧nar‧i‧an /ˌɒktəʊdʒəˈneəriən, -tə- $ ˌɑːktoʊ-/ noun [countable]  OLD/NOT YOUNGsomeone who is between 80 and 89 years old
Examples from the Corpus
octogenarianHiking trails combine history and nature, and are strenuous enough, or gentle enough, for both teen-agers and octogenarians.Some 40 assemblymen are now in their nineties; almost half are octogenarians.There were six other octogenarians also in attendance and between them they had notched up 170 years service with P&O companies.Rumors were rampant that the octogenarian was senile and in poor health.The octogenarians were well respected too.Here was a man who saw modern life as a foreign country: this twinkling octogenarian came across asa time-traveller.
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