1.
He is a generous middle-aged man.
他是一个慷慨的中年人。
2.
His father is middle aged.(or His father is a middle aged man.)
他父亲是个中年人。
3.
Middle age should know the definition of age in a right way;
中年人应正确理解年龄的定义(英文)
4.
middle and old aged workers
中老年工人中老年工人
5.
The old stayed at home while the young went to war.
青年人去打仗，老年人则留在家中。
6.
I am already a middle-aged man.
我已是一个中年的人。
7.
the youngest member of a group (not necessarily young).
一个团体中最年轻的人。
8.
the geriatric ward of a hospital
医院中的老年人病房.
9.
The lecturer was a middle-aged man.
演讲者是个中年男人。
10.
Which of them is the eldest?
他们中哪个人年龄最大？
11.
Chinese people celebrate the lunar New Year.
中国人庆祝农历新年。
12.
Fifty Years of Progress in China's Human Rights
中国人权发展50年
13.
the grand climacteric
(人一生中的) 大厄年
14.
At 40 a man has reached middle age.
到40岁，人已进入中年。
15.
At the age of40a person has reached middle age.
人在四十岁时已到中年。
16.
By the end of last year, the Chinese population had reached 1,185 million, a net increase of 13.34 million from a year ago.
到去年年末，中国人口已达到
17.
Being the junior of two people having the same name.
年龄较小的同名的两人中年龄较小的
18.
An old Chinese saying goes， “It takes ten years to grow trees but a hundred years to rear people”.
中国有句古话: “十年树木，百年树人。”