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4. Stay Social

Card games and book clubs also keep you socially active -- another plus for your brain.

"The more social connections someone has, the better they are at preserving mental function and memory," Turner says.

Social interaction also enhances memory through its effects on mood. "We see a lot more depression in people who are socially isolated," Husain says. "Depression itself can cause dementia."

5. Sleep Right

Try to get a good night's sleep. "Attention and concentration go down when sleep is restless, and mental function is not as sharp as it is in those who have normal, restful sleep," Husain says.

Try these tips to get better sleep:

  • Avoid big meals before bed.
  • Go to bed at the same time each night and get up at the same time each morning.
  • Don't drink caffeine or alcohol close to your bedtime.
  • Avoid smoking or other forms of nicotine.

6. Stop Stress

"Being under stress is very bad for your brain," Turner says. High levels of the stress hormone, cortisol, make it harder to pull out information from your brain's memory.

To relieve stress, try different ways to relax, like meditation, yoga, or massage.

7. Stub Out Cigarettes

If you smoke, quit. Smoking speeds up memory loss as you age.

Smoking's effect on memory is probably due to small strokes it can cause in the brain, Turner says. Try nicotine replacement, medicine, or counseling to help you kick the habit for good.

8. Get Checked

Sometimes, medical conditions like thyroid disease, diabetes, depression, or a vitamin deficiency can trigger memory loss.

Certain medicines, such as sleep and anxiety drugs, can also affect your ability to remember. See your doctor to get checked and treated for these problems, and to go over all your medicines.

9. Use Memory Tricks

When you have trouble with everyday memory, it helps to have a few tricks up your sleeve. Every time you learn a new name or word, say it out loud to seal it into your brain. Mentally connect each new name with an image. If you meet a girl named April, picture a tree in bloom to represent the month of April.

To help with recall, post sticky notes around the home and office, or set reminders on your phone so you'll know when it's time to take your medicine or head to an important meeting.