首先，这个数字是根据增长数据计算出来的，而这些数据比议会无党派美国国会预算局和私营企业预测的数字都要高。

First, it is based on growth figures that are better than those projected by either the non-partisan Congressional Budget Office or private-sector forecasters.

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美国国会预算局估计，老龄化将只占未来数十年内健康卫生成本上升因素的四分之一，在其他发达国家，该比例也大致相仿。

The CBO estimates that ageing accounts for only a quarter of the health-care inflation to come in the next few decades, and the share in other rich countries is similar.

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