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Different parts of America are aging in different ways. In some areas, the young leave for jobs and schooling while older adults age-in-place. In other areas, immigration or high fertility rates more than offset growth in the elderly population with new children. Trends like these result in counties' widely divergent age structures, which are reflected in "population pyramids." Take a look at a few of the examples, below. These charts show the future: a broad base means fast growth, a straight trunk means slow. Of course, Towner County, North Dakota is a bit more enigmatic.
| Greatest Generation (1926-35) | McPherson County, South Dakota |
| Lucky Generation (1936-45) | Mohave County, Arizona |
| Early Baby Boomers (1946-55) | Franklin County, Pennsylvania |
| Late Baby Boomers (1956-65) | Douglas County, Oregon |
| Generation X (1966-75) | Los Angeles County, California |
| Generation Y (1976-1985) | Wasatch County, Utah |
Source: Census 2000 analyzed by the Social Science Data Analysis Network (SSDAN).
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