When jack was in his 20s, he was more emotional and less conscientious in his job. now that he is in his 40s, he is more emotionally stable and more agreeable in his work and family life. jack's change illustrates?

The answer is maturity principle. From the ages of 20 to 65, individuals report increments in positive attributes, for example, uprightness, and reductions in negative qualities, for example, neuroticism. The vast majority have a tendency to wind up more pleasing, more dependable, all the more candidly steady, and their identities move forward.