I remember seeing a news report a few years back where some doctors were encouraging senior citizens to play video games. The doctors said it kept up their hand/eye coordination, and in some cases was good for arthritis; keeping their hands active and their joints from stiffening up.
Neither one of my grandma's could ever make heads or tails out of video games, and could care less about them. But they never gave me hell for enjoying them...my parents on the other hand...well, that's another story.