Definition of septuagenarian noun from the Oxford Advanced Learner's Dictionary

 

septuagenarian

 noun
noun
BrE BrE//ˌseptjuədʒəˈneəriən//
 
; NAmE NAmE//ˌseptʃuədʒəˈneriən//
 
(formal)
 
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a person between 70 and 79 years old Word Origin late 18th cent.: from Latin septuagenarius (based on septuaginta ‘seventy’) + -an.
See the Oxford Advanced American Dictionary entry: septuagenarian