Search Results Use the search box below to revise your search, or start a new search. Studies (2) Variables Publications Your query returned 2 studies. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Longitudinal Study of Generations, 1971, 1985, 1988, 1991, 1994, 1997, 2000, 2005 [California] (ICPSR 22100) Silverstein, Merril; Bengtson, Vern L. 2. National Survey of Midlife Development in the United States (MIDUS Refresher), 2011-2014 (ICPSR 36532) Ryff, Carol; Almeida, David; Ayanian, John; et al.