国会预算办公室：2026年至2056年人口展望报告（英文版）

The size of the U.S. population and its composition by age and sex have significant implications for the economy and the federal budget. For example, the number of people at the prime working ages of 25 to 54 affects the number of people who are employed, and the size of the population age 65 or older affects the number of Social Security and Medicare beneficiaries. In this report, the Congressional Budget Office describes its population projections, which underlie the baseline budget project