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quinquagenarian

adjective
quin·​qua·​ge·​nar·​i·​an | \¦kwinkwə̇jə̇¦na(a)rēən, (¦)kwin¦kwäj-\

Definition of quinquagenarian 

(Entry 1 of 2)

: fifty years old : characteristic of a person of such an age

quinquagenarian

noun
\"\
plural -s

Definition of quinquagenarian (Entry 2 of 2)

: a quinquagenarian person

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History and Etymology for quinquagenarian

Adjective

Latin quinquagenarius of fifty, fifty years old (from quinquageni fifty each—from quinquaginta fifty—+ -arius -ary) + English -an

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