Professor Art Kramer, of the Beckman Institute at the University of Illinois, in a recent research study found that aerobic activity increased the speed and sharpness of thought, the actual volume of brain tissue, and the way in which the brain functions in the elderly.
It has long been known that aerobic exercise was effective at reversing age-related mental decline and improved neural plasticity in the brains of older adults.
Erickson K, Kramer AF.
Exercise effects on cognitive and neural plasticity in older adults.
Br J Sports Med. 2008 Oct 16. [Epub ahead of print]
“We argue that six-months of moderate levels of aerobic activity are sufficient to produce significant improvements in cognitive function … that translate into a more efficient and effective neural system.”
This is more documentation that retaining your mental faculties as your age is under your own control. All it takes is regularly engaging in moderate levels of aerobic activity.