Journal Article Age Parameters of Young Adult, Middle-Aged, Old, and Aged Get access Paul Cameron, PhD Paul Cameron, PhD 1Department of Psychology, Wayne State UniversityDetroit 48202. Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Gerontology, Volume 24, Issue 2, April 1969, Pages 201–202, https://doi.org/10.1093/geronj/24.2.201 Published: 01 April 1969
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Paul Cameron (1969) studied this question.