Particularly important for adult learners, neuroscience demonstrates that theorists like Freud, Piaget, and Erikson were wrong when they concluded that adulthood marked the end of development and the beginning of decline to death. Contrarily, Cohen (2006) argues that neurology shows how adulthood is a "time of new possibility" with immense potential to nurture. Cohen said, "It's time we stopped dismissing middle age as the beginning of the end… At 40, the brain's best years are still ahead" (p. 82). Cohen's assertion does not seem to be "feel good" optimism for fogies; he bases his conclusions on a growing amount of evidence from neuroscientists.