大量有资格领取社会保障福利的美国老年人将在未来30年使得社会保障计划支出相对GDP的比例从当前的4.9％上升至6.3 ％ 。
The larger number of older Americans who are eligible for Social Security benefits will drive the program’s costs from 4.9% of GDP this year to 6.3% of GDP over the next 30 years.