quadragenarian

noun
quad·ra·ge·nar·i·an | \ ˌkwädrəjə̇ˈna(a)rēən \
plural -s

Definition of quadragenarian 

(Entry 1 of 2)

: a person who is 40 or more and less than 50 years old

quadragenarian

adjective

Definition of quadragenarian (Entry 2 of 2)

: 40 or between 40 and 50 years old

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History and Etymology for quadragenarian

Noun

Latin quadragenarius of forty, forty years old (from quadrageni forty each—from quadraginta forty—+ -arius -ary) + English -an, noun suffix

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