The article reviews the evidence for mean-level change and individual differences in personality traits across the lifespan. It highlights that personality traits continue to develop and change in adulthood, with significant changes occurring between the ages of 20 and 40. People tend to become more self-confident, warm, self-controlled, and emotionally stable with age. These changes are observed in middle and old age, indicating that personality traits can change at any age. Individual differences in personality change are also discussed, showing that people exhibit unique patterns of development at all stages of life, influenced by specific life experiences. The article emphasizes the importance of understanding both mean-level changes and individual differences in personality development, suggesting that these changes are driven by life experiences and may have significant implications for health and well-being.The article reviews the evidence for mean-level change and individual differences in personality traits across the lifespan. It highlights that personality traits continue to develop and change in adulthood, with significant changes occurring between the ages of 20 and 40. People tend to become more self-confident, warm, self-controlled, and emotionally stable with age. These changes are observed in middle and old age, indicating that personality traits can change at any age. Individual differences in personality change are also discussed, showing that people exhibit unique patterns of development at all stages of life, influenced by specific life experiences. The article emphasizes the importance of understanding both mean-level changes and individual differences in personality development, suggesting that these changes are driven by life experiences and may have significant implications for health and well-being.