年龄中位数的英文：
median age

median是什么意思：
adj. 中间的，中央的
n. 中位数，中线，中点，中间安全岛，米堤亚人

recycled rubber median strip
再生橡胶高级公路中间分界之安全岛

The median value of 17, 20, and 36 is 20; the median income for the year was $15,000.
17，20，和36的中间数是20；今年的平均收益是15，000美圆。

A broad landscaped highway, often divided by a planted median strip.
风景区干道，园道，公园大道一条通常用栽种了树木的中间地带隔开的美化的宽阔公路

age是什么意思：
n. 年龄；时代，时期；年龄段
v. 长大，变老

This is a bulletin on aging.
这是关于老龄问题的期刊。

They are close in age.
他们年龄相仿。

It will be a production that will be handed on from age to age.
这将是传世之作。

Attach importance to the problem of population aging (an aging population )
重视老龄化问题

One has reached the age of no doubting—forty years of age
年登不惑