Final answer:
According to the cumulative personality model of personality development, as people age, they become more adept at gradually improving on existing skills.
Step-by-step explanation:
According to the cumulative personality model of personality development, as people age, they become more adept at gradually improving on existing skills. This view suggests that development is a cumulative process, where individuals continue to build on their existing abilities and acquire new skills over time. For example, as individuals grow older, they may become more skilled at managing their personal relationships and careers. This is supported by research on the Big Five personality factors, which shows that conscientiousness and agreeableness tend to increase with age.