sexagenarian
noun/ˌseksədʒəˈneəriən/
/ˌseksədʒəˈneriən/
- a person between 60 and 69 years oldWord Originmid 18th cent.: from Latin sexagenarius (based on sexaginta ‘sixty’) + -an.
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sexagenarian
Definition of sexagenarian noun from the Oxford Advanced Learner's Dictionary