From Scientific American:
Training the brain with a computer workout program may be better than classic computer games at staving off age-related mental decline, scientists reported on Friday. While the computer and video game store has long been the bastion of teenagers and hard-core gamers, a host of new games for older folk have made their way into the stores.
The games, from companies like Nintendo and Mattel Inc., are based on studies showing that with a little training, older people can improve their brain power.Researchers in Israel compared how one brain-training program, MindFit, fared versus a workout with a sampling of classic computer games, such as the puzzle game Tetris.
Both groups benefited, but the group using the MindFit program showed a statistically significant improvement in spatial short-term memory, spatial learning and focused attention.
More here.