Английский разговорный словарь (основной) - quinquagenarian
Quinquagenarian
quinquagenarian
ˈkwɪŋkwədʒɪˈnɛərɪən n. & adj. --n. a personfrom 50 to 59 years old. --adj. of or relating to thisage. [L quinquagenarius f. quinquageni distrib. of quinquaginta fifty]