“…The decrease from middle adulthood to old age varied much more strongly across studies, with the effect size ranging from about d = −0.20 to −0.70. Overall, this pattern of the life-span trajectory is supported by longitudinal research on mean-level change during specific developmental periods, such as adolescence and young adulthood (Birkeland, Melkevik, Holsen, & Wold, 2012;Chung, Hutteman, van Aken, & Denissen, 2017;Chung et al, 2014;Erol & Orth, 2011;Galambos, Barker, & Krahn, 2006;Harris, Wetzel, Robins, Donnellan, & Trzesniewski, 2018;Kiviruusu, Huurre, Aro, Marttunen, & Haukkala, 2015;Wagner, Lüdtke, Jonkmann, & Trautwein, 2013;Zeiders, Umaña-Taylor, & Derlan, 2013) and old age (von Soest, Wagner, Hansen, & Gerstorf, 2017;Wagner, Gerstorf, et al, 2013;Wagner, Hoppmann, Ram, & Gerstorf, 2015;Wagner, Lang, Neyer, & Wagner, 2014).…”