What factors determine which of us will make it past age 90?

Living to 90 and beyond. Watch this interesting 60 minutes story... Men and women above the age of 90 are now the fastest-growing segment of the U.S. population. Yet very little is known about the oldest old, since until recently, there were so few of them. So what determines which of us will make it past age 90? What kind of shape we'll be in if we do? And what can we do now to up our odds? Finding out is the goal of a groundbreaking research study known as "90+." 

http://www.cbsnews.com/news/living-to-90-and-beyond/ 

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