Answer:
According to psychologists, Brett is actually in better cognitive shape than Thomas, despite being six years older. This phenomenon is due to the concept of cognitive reserve, which refers to the brain’s ability to compensate for age-related changes and damage. Cognitive reserve is built up over a lifetime through experiences such as education, occupation, and leisure activities. Brett’s healthy lifestyle and habits may have contributed to his cognitive reserve, while Thomas’s poor health may have depleted his cognitive reserve.