Strengthen the muscles surrounding your knees

1. Finger length
Women whose index fingers are shorter than their ring fingers may be twice as prone toosteoarthritis in the knees, found a 2008 study in the journal Arthritis & Rheumatism. Those with this predominately male characteristic tend to have lower levels of estrogen, which may also play a role in the development of osteoarthritis, say researchers.

Prevent it: Strengthen the muscles surrounding your knees. While sitting, straighten each leg parallel to the floor 10 times; hold each rep for 5 to 10 seconds.

2. Height
Women taller than 5-foot-2 may be missing a gene mutation that helps them reach their 100th birthday, according to a study in Proceedings of the National Academy of Sciences.

Prevent it: Take a page from the habits of California’s Seventh-Day Adventists, who have one of the highest concentrations of centenarians: Quit smoking, and cut back on alcohol and eating meat.

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3. Leg length

If your legs are on the stocky side, you may need to take better care of your liver. In a 2008 study published in the Journal of Epidemiology and Community Health, British researchers found that women with legs between 20 and 29 inches tended to have higher levels of four enzymes that indicate liver disease. Factors such as childhood nutrition may not only influence growth patterns, but also liver development well into adulthood, say researchers.

Prevent it: Avoid exposure to toxins your liver has to process, which will keep it healthier, longer. Wear a mask and gloves while cleaning or working with any type of harsh chemical. Limit alcohol intake to one 5-ounce glass of wine or 12-ounce bottle of beer daily.