Among the primary interventions identified to ward off dementia are increasing physical activity and social contact, and decreasing depression.
An idea that came to me early in my applied improvisation training was that these exercises were like brain-training games, but instead of an individual alone with a screen, they are instead experiencing physical activity, social engagement, and the benefits of laughter. And all three of these elements are key in combating depression. And these are only a few of the benefits of improv! Cool, huh?