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I came across all kinds of fascinating studies in researching this book, but one of my favorites comes from Jack Zenger and Joseph Folkman, called “How Age and Gender Affect Self-Improvement” (Harvard Business Review, 2016). Drawing on Carol Dweck’s work on fixed versus growth mindsets, they studied seven thousand businesspeople through self assessments and 360-degree reviews from coworkers. They found that older people were more open to self-improvement and less defensive to criticism because they had evolved over time to focus on improving instead of just proving themselves. And the researchers found that the more self confidence individuals have, the more willing they are to change.