This study is unique in that it looks at a combination of different lifestyle and personality traits, said Dr. Yaakov Stern, professor of clinical neurology at Columbia University Medical Center, who was not involved with the study.

CNN: Less-stressed people may have lower dementia risk

Dr. Timothy Vollmer, the director of Neurology Clinical Research at the University of Colorado-Denver, even says that such activity can be beneficial.

CNN: STORY HIGHLIGHTS