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septuagenarian

noun [C]
 
 
/ˌsep.tjʊə.dʒɪˈneə.ri.ən/ US  /-tu.ə.dʒəˈner.i-/

Definition

a person who is between 70 and 79 years oldThe elderlyOld or old-fashionedDescribing people who are oldDescribing age and birthdays
(Definition of septuagenarian noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of septuagenarian