One of the major demographic trends in the U.S. (and in other developed nations) is that people are living longer. According to the Centers for Disease Control and Prevention, the life expectancy of the average person in America has increased from 76.8 years in 2000 to 78.7 years in 2018. As shown in Figure 1 below, the percentage of people 55 and over in the labor force has more than doubled since the 1990s, with about 37 million older Americans in the workforce as of March 2021. With so many people choosing to work longer, companies will have to manage more older workers in the years to come, a situation that poses an interesting question: is chronological age a good indicator of someone's work capacity? In other words, do older workers show similar traits at a given age point, or is chronological age perhaps not a fully accurate indicator of what someone can contribute in the later stages of a career?