age(d)
1.下面各句意思相同：
- I am twenty years of age.
- I am aged twenty.
- I am aged twenty years.
- My age is twenty.
- My age is twenty years.
另外也可说I am twenty years old和I am twenty，但不可说I am twenty of age, I am twenty years of my age, My age is twenty years old，或I am aged twenty years old。
（I am aged twenty years有时可能作“我［在容貌上或精神上好似］老了二十年”解。）
2.age前面可以用at，in或of，但意思不同：
- He died at the age of ninety.
- He died in his old age.
- He died in an age of general unrest.
- He is of my age.
第一句里的age指“年龄”，前面用at。第二句里的age指“人生的一段时间”，前面用in。第三句里的age指“时代”，前面用in。第四句里的of my age（跟我同年的）是形容词短语，前面用of。
3.at the age of...里用the，不可用an。
4.advanced age是“高龄”，old age是“老年时期”，所以可以说He died at an advanced age和He died in his old age，但不可说He died at an old age和He died in his advanced age。但虽然不说at an old age，却可以说at an extremely old age和at a good old age。
5.when I was of your age, a boy of about my age, a man of twice my age, of what age he is等表达方式里的of往往省去。I don't know what age he is和What age do you think he is? 不及I don't know how old he is和How old do you think he is? 普通。What age are you? 不合习惯，该改作How old are you?
6.old age是“老年”，middle age是“中年”（从四十岁左右到六十岁左右）。old age和middle age前面没有the。说“少年”通常用youth，不说young age。单用age指old age现在很少见。
7.不可说My age is young或His age is old，该说I am young和He is old。
8.middle age是“中年”，the Middle Ages（有时写作the middle ages）是“中世纪”（没有一定的年限）。两种表达方式不可混用。相当于middle age的形容词是middle-aged，相当于the Middle Ages的形容词是medi(a)eval。
9.old age不可用作“古代”解。“古代”该说ancient times。
10.of an age是“同年龄的”，如He and I are of an age, 但You are of an age to understand such things是“你到了了解这种事的年龄了”，of the age是“当代的”，of age是“成年的”。
11.假定你从生下来到现在，共有十八年零几个月，那末可说eighteen，但实际已到了第十九年，所以也可说in my nineteenth year，而且离十九岁不远了，所以也可说coming nineteen, going nineteen或rising nineteen。
12.for ages和for an age都作“经过很长时间”解。例如：
- He kept me waiting for ages. （他使我等待了好久。）
- He kept me waiting for an age.
