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The Journals of Gerontology Series A: Biological Sciences and Medical Sciences Advance Access originally published online on February 4, 2009
The Journals of Gerontology Series A: Biological Sciences and Medical Sciences 2009 64A(2):286-292; doi:10.1093/gerona/gln010
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© The Author 2009. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org.

Poverty and Biological Risk: The Earlier "Aging" of the Poor

Eileen M. Crimmins1, Jung K. Kim1 and Teresa E. Seeman2

1 Andrus Gerontology Center, University of Southern California, Los Angeles
2 Division of Geriatrics, Geffen School of Medicine, University of California, Los Angeles

Address correspondence to Eileen Crimmins, PhD, Andrus Gerontology Center, 3715 McClintock Ave., Los Angeles, CA 90089-0191. Email: crimmin{at}usc.edu


  Abstract

Background: We examined age differences in levels of biological risk factors in the U.S. population by poverty status. It is not clear how socioeconomic status differentials in biological risk change with age because of mortality.

Methods: We used two nationally representative samples (National Health and Nutrition Examination Survey [NHANES] III, 1988–1994, and NHANES, 1999–2004) with data for more than 12,000 people aged 20 and older in each data set to examine biological risk for persons in families with incomes below and close to poverty level and those with higher income. We examined how mortality and life expectancy in the earlier sample are related to poverty status and biological risk. We examined life table survivorship to clarify how mortality differentially removes those who are poor and those with high biological risk from the population.

Results: Differences in biological risk by poverty status are larger before old age and become insignificant at older ages. Life expectancy at age 20 differs markedly by biological risk and poverty status.

Conclusions: Population differentials in health at older ages result from a lifetime of differences. Socioeconomic differences in health in old age disappear because of health and mortality differentials at earlier ages. Poorer people "age" earlier and this affects the age pattern of social differentials.

Keywords Poverty; Biological risk; Mortality; Gender; Life expectancy; NHAHES; SES differentials

Received: October 30, 2007; Accepted: May 5, 2008

Decision Editor: Luigi Ferrucci, MD, PhD


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