quinquagenarian

quin·qua·ge·nar·i·an

Q0035300 (kwĭng′kwə-jə-nâr′ē-ən)n. A person 50 years old, or in his or her fifties.adj. Of or characteristic of a person in his or her fifties.
[From Latin quīnquāgēnārius, containing fifty, from quīnquāgēnī, fifty each, from quīnquāgintā, fifty; see penkwe in Indo-European roots.]

quinquagenarian

(ˌkwɪŋkwədʒɪˈnɛərɪən) na person between 50 and 59 years oldadj1. being between 50 and 59 years old2. of or relating to a quinquagenarian[C16: from Latin quinquāgēnārius containing fifty, from quinquāgēnī fifty each]

quin•qua•ge•nar•i•an

(ˌkwɪŋ kwə dʒəˈnɛər i ən, ˌkwɪn-)

n. a person who is 50 years old or between 50 and 60. [1560–70; < Latin quīnquāgēnāri(us) containing fifty quīnquāgēn(ī) fifty each]
Translations
cinquantenne