Age, poverty, and isolation from friends in the urban working class.
D001741:Black or African American; D000368:Aged; D000375:Aging; D006801:Humans; D007182:Income; D007398:Interpersonal Relations; D008297:Male; D008875:Middle Aged; D009790:Occupations; D010414:Pennsylvania; D011203:Poverty; D011822:Race Relations; D012179:Retirement; D012923:Social Class; D012934:Social Isolation; D012959:Socioeconomic Factors; D014505:Urban Population; D044465:White People