For example, economists can plot a relationship between the proportion of the population aged between 35 and 59 (when people save most) and the level of real interest rates.

比方说，经济学家可以画出35岁至59岁人群(存最多钱的一部分人)的比例与实际利率水平的关系曲线。

youdao

The problems of the elderly are attracting greater attention largely because the American population is growing steadily older as the proportion of its aged members increases.

老年人的问题正在引起更为广泛的关注，主要是因为随着老年人口比率的增加，美国人口正在逐步趋于老龄化。

youdao

Over the past century, the age profile of the population has become much older, with the proportion aged under 15 falling from 32% in 1911 to 16% last year, while the proportion aged 65 and over has increased from 5% to 17%.

BBC: Census shows 'highest' Scottish population ever