人口年轻化的英文：
rejuvenation of population

All this signs rejuvenation of agriculture.
所有这些都预示着农业将复苏。

The mountain air will rejuvenate you.
山上的空气将使你变得年轻。

The rejuvenation (revitalization) of the Chinese nation
振兴中华

Rejuvenate the market (city) By applying scientific and technological advances
科技兴市

China's rejuvenation(revitalization) and the progress of mankind
中华民族的振兴与民族进步

The population is on the decline.
人口在减少。

The population is dwindling.
人口在逐渐减少。

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

There was a swell in the city's population.
该市出现过人口膨胀。

The town has a population of ten thousand.
这个镇有一万人口。