| Age classes, in years | ||||||||
| Year | < 5 | 5-14 | 15-24 | 25-34 | 35-44 | 45-54 | 55-64 | > 64 |
| millions | ||||||||
| 1940 | 10.6 | 22.4 | 24.0 | 21.5 | 18.4 | 15.6 | 10.7 | 9.0 |
| 1950 | 16.2 | 24.3 | 22.1 | 23.8 | 21.5 | 17.3 | 13.3 | 14.5 |
| 1960 | 20.3 | 35.7 | 24.6 | 22.9 | 24.2 | 20.6 | 15.6 | 16.7 |
| 1970 | 17.2 | 40.7 | 36.5 | 25.3 | 23.1 | 23.3 | 18.7 | 20.1 |
| 1980 | 16.4 | 34.9 | 42.8 | 37.3 | 25.7 | 22.8 | 21.7 | 25.6 |
| 1985 | 18.0 | 33.9 | 39.8 | 41.6 | 31.8 | 22.6 | 22.3 | 28.5 |
| 1990 | 18.9 | 35.3 | 36.9 | 43.1 | 37.8 | 25.2 | 21.1 | 31.2 |
| 1991 | 19.2 | 35.9 | 36.4 | 42.9 | 39.3 | 25.8 | 21.0 | 31.8 |
| 1992 | 19.5 | 36.4 | 36.2 | 42.4 | 39.9 | 27.4 | 20.9 | 32.3 |
| 1993 | 19.7 | 36.9 | 36.2 | 41.8 | 40.8 | 28.7 | 20.9 | 32.8 |
| 1994 | 19.7 | 37.5 | 36.1 | 41.2 | 41.7 | 29.9 | 21.0 | 33.2 |
| 1995 | 19.5 | 37.9 | 36.2 | 40.7 | 42.6 | 31.1 | 21.1 | 33.6 |
| 1996 | 19.3 | 38.4 | 36.2 | 40.2 | 43.4 | 32.3 | 21.4 | 34.0 |
| 1997 | 19.1 | 38.8 | 36.6 | 39.5 | 44.0 | 33.6 | 21.8 | 34.2 |
| 1998 | 19.0 | 39.2 | 37.2 | 38.8 | 44.6 | 34.6 | 22.7 | 34.4 |
| 1999 | 18.9 | 39.5 | 37.8 | 37.9 | 44.8 | 35.8 | 23.4 | 34.5 |
| 2000 | 18.9 | 39.7 | 38.6 | 37.2 | 44.8 | 37.7 | 24.2 | 34.9 |
Sources: U.S. Department of Commerce, Bureau of the Census, Historical Statistics of the United States: Colonial Times to 1970, Part I, Series A 30-37 (GPO, Washington, DC, 1975), U.S. Population Estimates, by Age, Sex, Race, and Hispanic Origin, Current Population Reports, Series P-25, No. 1045 (1990) and No. 1095 (1993) (GPO, Washington, DC), and Population Paper Listing PPL-91 R (DOC, Census, Washington, DC, 1998), and Resident Population Estimates of the United States by Age and Sex: April 1, 1990 to July 1, 1999, with Short-Term Projection to November 1, 2000 (an Internet accessible data file, release date: January 2, 2001).
Note: Annual population estimates are for November 1, 2000 and for July 1 of each other year.
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