Oh no, you think. Is this a sign of Alzheimer’s? Am I losing my brainpower? If you have such concerns, you’re not alone. A recent survey by the Alzheimer’s Association showed that 60 percent of people worldwide believe—incorrectly—that Alzheimer’s is an inevitable part of aging, a worry second only to getting cancer. The good news is that there is more information than ever available these days about staving off mental decline and staying sharp into your twilight years. There are ways to distinguish normal, age-related memory glitches from dementia or Alzheimer’s: If you find yourself unable to recall the details of an event or conversation from a year ago, that’s normal; but if you find yourself unable to remember the details from an event or conversation from last week, that’s reason to check with your doctor.

Here are the three primary risk factors for brain decline:

Even if you have such risk factors, you will not necessarily develop the disease. Plus, there are many preventative steps you can take.