Search Results Use the search box below to revise your search, or start a new search. Studies (3) Variables Publications Your query returned 3 studies. Series results are grouped under the most relevant study. Ungroup series results to view all results. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Census of Population and Housing, 1980 [United States]: Special Tabulations of Population 60 Years and Over (ICPSR 8533) United States Department of Commerce. Bureau of the Census 2. Old Age in the United States, 1880 (ICPSR 8427) Jensen, Richard; Smith, Daniel Scott; Friedberger, Mark W.; et al. 3. Old Age in the United States, 1900 (ICPSR 8428) Jensen, Richard; Smith, Daniel Scott; Friedberger, Mark W.; et al.