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Journal Article Aging and Individual Differences: A Longitudinal Analysis of Social, Psychological, and Physiological Indicators Get access George L. Maddox, PhD, George L. Maddox, PhD 2Duke Univ. Center for the Study of Aging and Human DevelopmentDurham, Nc 27710. Search for other works by this author on: Oxford Academic PubMed Google Scholar Elizabeth B. Douglass, MA Elizabeth B. Douglass, MA 2Duke Univ. Center for the Study of Aging and Human DevelopmentDurham, Nc 27710. Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Gerontology, Volume 29, Issue 5, September 1974, Pages 555–563, https://doi.org/10.1093/geronj/29.5.555 Published: 01 September 1974
Maddox et al. (Sun,) studied this question.