men of old 古代的人们.

a ten-year old
ten-year-olds十岁的孩子们.

old and young =young and old.

He looks old for his age. 他看起来比他的年龄大.
He is the oldest boy in the class. 他是班上年龄最大的男孩.
one's older [oldest] sister 【美】姊姊[大姊]
one's old brother 【口】 哥哥
grow old 变老,上年纪.

a boy (of) ten years old=a ten-year-old boy 十岁的男孩
at ten years old 十岁时
How old is the baby?-He is three months [weeks] old. 这婴儿多大了?-三个月[周]。
He is five years older than I (am). 他比我大五岁.
a house 20 years old 二十年之久的房子.

(as) old as the hills [world] 极老;极古;极陈旧,老掉牙的 (immemorial)
old school
an old wine 陈酒
an old tradition 古老传统
old fashions 旧[过时]式样
old clothes 旧衣服
an old pupil of mine 我以前的一个学生
an old Harrovian 哈罗学院的老校友.

an old friend 老朋友
old familiar faces 旧识
my dear old fellow 老兄
old boy [chap, man, thing] 老弟[老兄,老朋友]
good old George 我的好乔治
(the) good old days 以往令人怀念的那些日子
the bad old days [【多用】iron.] 令人不快的往日
old England [London, Paris, etc.] 令人怀念的英国[伦敦、巴黎等].

an old joke 老掉牙的俏皮话
old fog(e)y
It's one of his old tricks. 这是他惯用的伎俩.
It's the old story. 这是老生常谈.

an old offender. 惯犯.

old rose 暗玫瑰色的.

We had a fine [high, good] old time. 我们过得很愉快.