There is no test yet to predict if someone will get late-onset Alzheimer’s, in which symptoms become apparent in a person’s mid-60s. If someone is worried about changes in his or her memory or other problems with thinking, he or she should talk with a doctor.

A doctor may ask the patient to make a family health history. A family health history can help a person know if Alzheimer’s disease runs in the family. It lists health facts about a person and close relatives. It is a written record of:

• A family’s health conditions
• Lifestyle habits like smoking and exercise
• Where and how family members grew up
• A family health history can show patterns of disease and risk factors. Try to include health facts about three generations—grandparents, parents, and children.

People can’t change the genes they inherit from their parents, but they can change things like diet, physical activity, and medical care to prevent diseases that may run in the family.

A doctor may suggest steps to stay healthy and watch for changes in memory and thinking. Steps include:

• Exercise regularly.
• Eat a healthy diet that is rich in fruits and vegetables.
• Spend time with family and friends.
• Keep one’s mind active.
• Control type 2 diabetes.
• Keep blood pressure and cholesterol at healthy levels.
• Maintain a healthy body weight.
• Stop smoking.
• Get help for depression.
• Avoid drinking a lot of alcohol.
• Get plenty of sleep.

There is a test to learn if a person has one of the three genetic mutations associated with early-onset Alzheimer's disease, which occurs between a person’s 30s and mid-60s.

If someone has a family history of early-onset Alzheimer's, he or she should talk with a doctor about getting tested.

A doctor may suggest meeting first with a genetic counselor. This type of counselor helps people learn the risk of getting genetic conditions. They also help people make decisions about testing and what comes next.