fifties
noun [ plural ] uk/ˈfɪf.tiz/ us/ˈfɪf.tiz/
B2 五十多岁
A person's fifties are the period in which they are aged between 50 and 59.
My dad's in his fifties. 我爸爸五十多岁了。
the fifties （温度）五十多度
the range of temperature between 50° and 59°
It's been in the fifties all week. 整个星期温度都在五十多度。