Well, 10 hours a day sounds a bit excessive, especially for someone her age. But, I'd give her the high five rather than puke. Apparently, some gaming can be a good thing for seniors. As the article says:
"While not all senior citizens possess Sainte-Hilaire's grit and gusto, many are discovering that video games are more than just entertainment.
They reinforce what a variety of scientific studies suggest: that video games can help keep aging brains nimble, encourage social interaction and quicken reaction times."
I have a 65 year old friend who enjoys playing Flight Simulator online in a multi-player mode. However, I don't believe he spends 10 hours a day doing it. He's got too many other interests to spend that much time on gaming.