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You are dead on with your idea- brain exercise is the key.
My grandmother who lived to 93 and never ever lost a bit of her brain always did the entire crossword every day, all of the jumbles, and other stuff like that. Sudoku is an awesome start- I wish I sould get paid to play that game.
A computer, if he doesn't already have one, would be the ticket. He can get hundreds of games, and you guys can play each other online even if you live far apart.
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