一、不同年龄怎么用英文精准表达？

3 days old-newborn baby

18 months-toddler（学步儿童）

8-child

14-teenager

20-adult

28-in his late twenties

35-in his mid-thirties

42-in his early forties

48-he is middle aged

85-he is fairly elderly（elderly是对老人的比较礼貌的称呼）

二、我有个2岁的孩子

表达1：I‘ve got a son. He is 2 years old.

表达2：I‘ve got a 2-year-old son.（2-year-old 作为形容词使用）

表达3：I‘ve got a son. He is a 2-year-old.（2-year-old 作为名词使用）

三、年龄的比较

You are the same age as me.

When I was your age

People of all ages

When you get to my age （老年人经常对年轻人说的话）

a child of his age

at your age

the age difference：the age difference has never been a problem.

over the hill：过了壮年，身体开始走下坡路了。As a professional football player, he is over the hill at the age of 35.

the wrong side of 50：50多岁（不要用来描述年轻人，小心挨打）：He is on the wrong side of 50.

you don‘t lookyour age（你看起来不显老，你看起来没有实际年龄那么大）

四、He is very ……for his age

当你想夸亲戚家小孩非常聪明，可以说：He is very bright for his age.（就他的年龄而言，他真是聪明！）

90岁的大爷还能健步如飞，可以夸他：He is very fit for his age.

Rita 阿姨徐娘半老，风韵犹存，可以说：She looks great for her age.

14岁的小红偷偷抹口红，可以说：She is quite grown-up for her age.

12岁的小蓝已经1米8了，可以说：He is very tall for his age.