Kegan2016 → Kegan, R., & Lahey, L. L. (2009). Reconceiving the challenge of change: The importance of individual development Immunity to change: How to overcome it and unlock potential in yourself and your organization(pp. 11-30). Boston, Massachusetts Harvard Business Press.
Mental peak at 25 is a misconception
Research shows that man never stops to develop the mental complexity. There is a positive trend across all ages.