FROM the booming anti-aging supplement industry to scientists in the lab, everyone wants to know the secrets of a long and healthy — even Google. Just last week, scientists made discoveries related to life-expectancy by studying the blood of a 115-year-old woman, and new research out this week in the prestigious medical journal BMJ reports that light-intensity physical activity every day leads to less disability in old age and a longer, healthier life.

The science behind longevity is continuously emerging. But until researchers figure out how to coax our cells to reverse their steady march toward death, here's a snapshot of what we know now.

Your personality affects how long you'll live. In The Longevity Project, one of the largest studies of its kind that spanned eight decades, Stanford researchers Howard S. Friedman and Leslie R. Martin found that conscientiousness beat out all other personality types when it comes to life expectancy. "The qualities of a prudent, persistent, well-organized person, like a scientist-professor — somewhat obsessive and not at all carefree" are the qualities that help lead to a long life.

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