Doctors say you should do crosswords, sodokus, or puzzles to keep your mind from aging, so download some games and play whenever you're sitting around, like at the doctor's office or waiting to pick up kids from school. You can connect with old friends and play on a smart phone or kindle, so you can take it with you and use that "down time" to rev up your brain. There are lots and lots of different games to play alone or with friends. (this is words with friends from facebook.com.)
Source: http://www.wikipedia.com
