assertiveness, liveliness, and surgency. Internal consistency, as measured by coefficient alpha, was .79 at age 18, .81 at age 25, .75 at age 29, and .75 at age 35 for the Impulsivity scale1; .85 at age 18, .88 at age 25, .85 at age 29, and .88 at age 35 for the Neuroticism scale; and .83 at age 18, .84 at age 25, .85 at age 29, and .86 at age 35 for the Extraversion scale.
