预计在未来许多国家中，老年人占人口比例将高于年轻人所占比例。
It is expected that there will be a higher proportion of older people than young people in many countries in the future.
这样一项政策改变了年龄结构：年轻人的人口比例下降，而老年人的比例增长。
Such a policy distorts the age structure: the proportion of population in the younger age groups goes down and proportion of the elderly increases.
在过去的4年中，老年人护理的需求增长了9%。随着对生命期望的攀升，需求还将增长更多(而工作的人口比例在缩水)。
Demand for elderly care has increased by 9% over the past four years, and it is set to rise further as life expectancy climbs (while the proportion of the population of working age shrinks).
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