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Although such conventional indices as the proportion of the aged and the median age have their own cognitive values for measuring the aging of populations, the shape of the age structure rather than the magnitude of certain age categories would be a better basis for measuring the degree of aging. The proposed new index is the slope of the linear least squares line as it is applied to the population pyramid. Application of the new index to the United States population since 1900 shows that the conventional indices exhibit either an exaggerated degree of aging or a different aging trend.
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Toshi Kii (1982) studied this question.
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