It's no longer rare to hear about people living into their nineties or even over one hundred and remaining well and alert. A friend's mother who reached the ninety mark was bluntly asked, "Aren't you weary of this world? You're not independent any more. Do you want to continue living?" Without skipping a beat, she said, "But I'm still curious. I'm curious about what kind of people my grandchildren and great-grandchildren are turning out to be, how the world is changing with the new technology and all.