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Despite the past century's fascination with measuring every facet of life, little is known about the "middle years." After all, living into middle age is a relatively recent phenomenon in human history. A white man born in 1900 in the United States had an average life expectancy of 48 years, and a white woman could hope to see 51 years. Consequently, much of the population either never reached or did not remain long in the developmental phase that we would now characterize as midlife. Although the pressing nature of age-related ill health precipitated a welcome and much-needed boom in information
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