septuagenarian
noun/ˌseptjuədʒəˈneəriən/
/ˌseptʃuədʒəˈneriən/
(formal)- a person between 70 and 79 years oldWord Originlate 18th cent.: from Latin septuagenarius (based on septuaginta ‘seventy’) + -an.
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septuagenarian