政府债务上升越来越快的一个主要原因是美国人口在迅速老龄化，这导致全民退休金和医保项目 — — 社会福利和医疗保险（Social Security and Medicare ） — —成本节节攀升。
A major reason for the accelerating growth in government debt is America’s rapidly aging population and the resulting increase in the cost of the universal pension and health-care programs – Social Security and Medicare.