比如，中国在2011年达到其老龄人口峰值时，人均收入仍只有美国水平的20 % ； 越南在2014年达到老龄人口峰值时，人均收入只有美国的10 % 。
For example, when China reached its old-age-population peak in 2011, its per capita income was still only at 20% of the US level; and when Vietnam reached it in 2014, that figure was just 10%.