title: Genetic and environmental influences in behavioral aging.
authors.affiliation: Center for Developmental & Health Genetics, Pennsylvania State University, University Park 16802.
authors.forename: G E
authors.initials: GE
authors.lastname: McClearn
mesh_terms: D000368:Aged; D000375:Aging / Q000502:physiology*; D001519:Behavior / Q000502:physiology*; D004777:Environment; D005824:Genetics, Behavioral / Q000379:methods*; D006801:Humans; D008875:Middle Aged; D011795:Surveys and Questionnaires; D014427:Twins