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Being a health procrastinator

Check in with an MD so that you know your numbers for cholesterol, blood pressure, and blood sugar.

If these are elevated, you're at risk for silent killers like heart disease, stroke, and diabetes.

One thought: The lifetime risk of developing hypertension, or high blood pressure, for adults in their mid-50s is approximately 90%, even with those who never had a problem before. "The general point is that just because you didn't have it at 24 doesn't mean you don't have it at 54," Dr. Ostfeld says.

Next: Smoking or living with a smoker