“…Contrary to the view long espoused by trait theorists that personality traits are "essentially fixed by age 30" (McCrae & Costa, 1994), data from several large-scale studies provide ample evidence that there is meaningful and significant change in mean levels of personality traits throughout adulthood, with the general trend that most people show decreases in neuroticism and increases in agreeableness and conscientiousness from early to middle and even later adulthood (e.g., Specht, Egloff, & Schmukle, 2011). These patterns of findings cannot be attributed primarily to the unfolding of intrinsic maturational processes, as there is substantial interindividual variability in the direction and rate of change as well as cohort differences (e.g., Bleidorn et al, 2013;Mroczek & Spiro, 2007).…”