how to live to be 100

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"What are the three most important things I can do if I want to live to be 100?"
Of course no one has a magic formula, but Marie Bernard, MD, deputy director of the National Institute on Aging, has a few ideas:

See your doctor regularly. "At the turn of the 20th century, the average American life-span was about 45 to 50 years," says Bernard. "Today people live well into their 70s and beyond, and many experts believe that increase is due in part to preventive health measures."

Maintain friendships. A new Brigham Young University review revealed that social isolation increases your risk of mortality by up to 32 percent—on par with obesity.

Learn a new skill. A recent University of Texas at Dallas study found that people who mastered a new and challenging skill (like digital photography or quilting) showed greater gains in memory than those who performed passive activities, like crossword puzzles. So get out there and start learning!