Add Yahoo as a preferred source to see more of our stories on Google. Regular exercise, a Mediterranean diet, and an hour of video games.

A new study suggests that engaging in a particular form of brain training may cut dementia risk for decades. spawns/Getty Images hide caption A little brain training today may help stave off Alzheimer's disease and other forms of dementia for at least 20 years.

An update on a decades-long investigation has suggested that brain training can lower the risk of dementia. The Advanced Cognitive Training for Independent and Vital Elderly (ACTIVE) study, which began in the late 1990s with nearly 3,000 older adults, evaluated how brain training impacts thinking and memory.