There are steps you can take to enhance your memory and help to delay or even prevent dementia. Lydia Cho, a neuropsychologist with Harvard-affiliated McLean Hospital, suggests focusing on DANCERS, a set of lifestyle criteria created by Dr. James Ellison, former director of the geriatric psychiatry program at McLean.

D: Disease management. Maintain a healthy weight, don't smoke, and keep blood pressure, cholesterol, and blood sugar levels in line to help preserve cognitive function.

A: Activity. Any cardio exercise, like walking, swimming, and playing sports, is good for brain health. "Cardio can increase energy in the brain by improving oxygen and blood flow," says Cho.

N: Nutrition. Poor nutrition leads to poor brain health. The DASH, MIND, and Mediterranean diets emphasize whole fruits and vegetables, whole grains, lean meats, fatty fish, and healthy fats.

C: Cognitive stimulation. "Challenge your brain regularly," says Cho. "The more you engage your brain, the more likely you can retain memory."

E: Engagement. Research continues to show a reliable link between isolation and lower cognitive function. Any kind of social engagement is helpful.

R: Relaxation. Your brain needs adequate downtime. Do activities that you find relaxing, whether it's exercise, yoga, meditation, reading, or bathing.

S: Sleep. Sleep is when your brain cleans out toxins. To get the recommended seven to nine hours of sleep per night, practice good sleep hygiene. Examples: Set a sleep schedule and stick to it. Avoid any electronic devices for at least an hour before bedtime. Don't eat after dinner time