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English definition of “octogenarian”

octogenarian

noun [C] uk   /ˌɒk.təʊ.dʒəˈneə.ri.ən/ us    /ˌɑːk.toʊ.dʒɪˈner.i-/
a person who is between 80 and 89 years oldThe elderlyOld or old-fashionedDescribing people who are oldDescribing age and birthdays
(Definition of octogenarian from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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