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Demographers calculate age distributions to better understand the structure
of the population. Marketers use the data to target growing age-cohorts with
advertisements and products. The most obviously feature of the national and
most state population pyramids is the post-war "baby-boom" bulge now in the
30-50 years-old range. The projected 2025 pyramid is a best-guess of birth,
death, and immigration rates, and shows that demographers expect relatively
high fertility and immigration rates in the future, which keep the pyramid
from becoming top-heavy as with so many other industrial countries.
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