Image credits: Jaromír Kavan. Hopefully, your elderly friends and family are in good driving shape. Nonetheless, age-related declines in cognitive functioning can occur. If this happens, it can affect one’s driving abilities. “Despite dementia and other neurobiological disorders that are associated with aging, improved imaging has revealed that even into our seventies, our brains continue producing new neurons,” notes the Dana Foundation, an organization based in New York committed to advancing brain research. As people age, their movements and reflexes can slow down. But there is little consistency in how these changes happen. Cognitive abilities show at least a small decline with age in many—but not all—healthy persons. In a recent study looking at cognitive peaks and declines, researchers found considerable variability in the changes of cognitive ability throughout life. For the sake of both drivers and pedestrians, we must pay attention to that variability.