quinquagenarian

quin.qua.ge.nar.i.an

n.（名词）
A person 50 years old, or in his or her fifties.
五十岁的人：五十岁的人、或处于五十岁至六十岁之间的人
adj.（形容词）
Of or characteristic of a person in his or her fifties.
五十岁的：五十多岁男人或妇女的，具有五十多岁男人或妇女特征的

来源：
From Latin quonqu3gôn3rius [containing fifty]
源自 拉丁语 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] *参见 penk we