quinquagenarian

詳細解釋：

quin.qua.ge.nar.i.an

n.（名詞）
A person 50 years old, or in his or her fifties.
五十歲的人：五十歲的人、或處於五十歲至六十歲之間的人
adj.（形容詞）
Of or characteristic of a person in his or her fifties.
五十歲的：五十多歲男人或婦女的，具有五十多歲男人或婦女特徵的

來源：
From Latin quonqu3gôn3rius [containing fifty]
源自 拉丁語 quonqu3gôn3rius [包括五十]
from quonqu3gôno [fifty each]
源自 quonqu3gôno [每人五十]
from quonqu3ginta [fifty] * see penk we
源自 quonqu3ginta [五十] *參見 penk we