“…For example, individuals who feel younger than they are live longer than those whose subjective age is close to or even older than their actual age (e.g., Kotter-Grühn et al, 2009; Intraindividual variability in subjective age 4 age suggests that it is a marker of individuals' physical and psychological functioning. Indeed, cross-sectional and longitudinal studies consistently find that a younger subjective age reflects better self-rated and objective health (Hubley & Russell, 2009;Infurna, Gerstorf, Robertson, & Berg, 2010;Knoll, Rieckmann, Scholz, & Schwarzer, 2004;Stephan, Caudroit, & Chalabaev, 2011;Westerhof, Barrett, & Steverink, 2003). In addition, lower depressive symptoms (Bergland, Nicolaisen, & Thorsen, 2013;Keyes & Westerhof, 2012) and higher mastery beliefs (Bergland et al, 2013;Infurna et al, 2010) have been found to be related to feeling younger than one's age.…”