“…1. depressive symptoms, measured using the Center for Epidemiologic Studies Depression Scale (Radloff 1977), scored as the mean rating of experiencing 20 symptoms in the past month on a scale of 0 (not at all), 1 (sometimes), 2 (most of the time), and 3 (almost every day) (Cronbach's α for the Center for Epidemiologic Studies Depression Scale in the Cross-Sectional and Longitudinal Aging Study was .88; Ruskin et al 1996); 2. cognitive impairment, measured using a memory-orientation-concentration scale (Katzman et al 1983) and defined by collapsing the raw score of a respondent's errors into a three-category scale of 0 to 8 errors (no impairment), 9 to 19 errors (some impairment), and 20 to 28 errors (full impairment); 3. cognitive vitality, consisting of an eight-item index representing tasks with cognitive components: having no problem identifying people; being able to write or use small objects; reading a newspaper often; attending movies, restaurants, concerts, or theater often; writing letters often; having no difficulty managing finances; having no difficulty using the telephone; and reported age at last birthday matching official age within one year (Walter-Ginzburg et al 2005) (scored as the mean of the 0 [no] and 1 [yes] response categories, with a higher score indicating higher vitality, ranging from 0 to 1); and 4. current life evaluation, measured by the answer to the question "Is your life today: (1) very difficult, (2) difficult, (3) pretty good, or (4) good? "…”