How can we best keep our brains fit as we grow older? It’s well known that regular cognitive activity, for example, brain teasers, sudoku, or certain video games in middle and old age, tends to protect against cognitive decline and dementias like Alzheimer’s. But many of us regularly engage in adult education classes, for example, learning a language or a new skill. Is such adult education likewise associated with a lower risk of cognitive decline and dementia?