“…Across literatures, a great deal of effort has been invested to properly estimate the independent influence of age, period, and cohort (APC) effects (e.g., Baltes, 1968;Costanza & Finkelstein, 2015;Costanza, Darrow, Yost, & Severt, 2017;Hofer & Sliwinski, 2006;Koslowski, 1986;Schaie, 1986;Yang, 2008;Yang & Land, 2013). For example, research has looked at the effect of age as a marker of individual development in the work context (e.g., Rudolph & Baltes, 2016), of major historical events on various populations (e.g., Elder, 1974;Elder & Liker, 1982), and on differences among cohorts (e.g., Gerstorf, Ram, Hoppmann, Willis, & Schaie, 2011;Schaie, 2013). However, in most of these studies, age, period, and cohort are not independent of each other and, hence, separating out their relative effects is challenging, if not impossible.…”