the amount of time that sb/sth has been in the world
one of the periods of a person's life
a certain time in history
become old or seem old
become fitter for use with the passage of time; have a fully-developed taste
"it was replaced because of its age"
"we live in a litigious age"
"she was now of school age"
"tall for his eld"
"we've known each other for ages"
"I haven't been there for years and years"
"old age is not for sissies"
"he's showing his years"
"age hasn't slowed him down at all"
"a beard white with eld"
"on the brink of geezerhood"
"The death of his wife caused him to age fast"
"She aged gracefully"
"we age every day--what a depressing thought!"
"Young men senesce"
"The death of his child aged him tremendously"
One man in his time plays many parts, His acts being seven ages.
出自：As You Like It , Shakespeare
He died at the age of ninety.（age指“年龄”)
He is of my age.（age指“同年”）
I am twenty years of age.
I am twenty.
I am twenty of age.
He died at an advanced age.（NOT He died at an old age.）
He died in his old age.（NOT He died in his advanced age.)
He kept me waiting for ages.
He kept me waiting for an age.
误 We reach the middle age before we know it.
正 We reach middle age before we know it.
析 old age(老年)和middle age(中年)之前均不用冠词。
误 I used to play table tennis after school when I was in that age.
正 I used to play table tennis after school when I was that age.
析 that age作“那个年龄”讲,可以直接作表语或定语,不必加任何介词。
误 His back is bent with ages.
正 His back is bent with age.
误 I am at the age of sixteen.
误 I am sixteen of age.
正 My age is sixteen years.
析 at the age of在句中一般不可用作表语。
误 Our teacher is a young-aged man.
正 Our teacher is a young man.
析 “年轻人”和“老年人”应说a young〔old〕 man,只有“中年人”才可说a middle-aged man.
误 My son's age is five years old.
正 My son is five years old.