QuickCheck: Does playing chess prevent dementia?

Chess is a thinking person's game, but does it exercise your mind enough to prevent dementia in old age?

GETTING older can throw many for a loop with all the biological and psychological changes that pop up as you age. However one of the terrifying aspects of reaching your twilight years is the risk of developing dementia. One strategy some seniors have followed to stave off dementia is to play chess as they believe the game helps to keep their mind active and clear.

So, does playing chess prevent dementia?