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

 

sexagenarian

 noun
noun
BrE BrE//ˌseksədʒəˈneəriən//
 
; NAmE NAmE//ˌseksədʒəˈneriən//
 
 
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a person between 60 and 69 years old Word Origin mid 18th cent.: from Latin sexagenarius (based on sexaginta ‘sixty’) + -an.
See the Oxford Advanced American Dictionary entry: sexagenarian