I. |kwinkwə̇jə̇|na(a)rēən, (|)kwin|kwäj- adjective
Etymology: Latin quinquagenari us of fifty, fifty years old (from quinquageni fifty each — from quinquaginta fifty — + -arius -ary) + English -an
: fifty years old : characteristic of a person of such an age
II. noun
( -s )
: a quinquagenarian person