Be Super-Social
Surround yourself with a vibrant social circle, and chances are your brain will stay vibrant, too. Studies from the Harvard School of Public Health found evidence that people who have an active social life may have a slower rate of memory decline. Make good friends now, and with any luck, you'll still remember their names when you're 90.

Practice Peter Piper
Need to remember a name, a place or some important info? Try to create an alliteration around it, and you'll increase your chance of memory recall later. Mnemonic devices are a terrific way to engage your mind and studies have shown that alliterative devices work even better than imagery for memory recall. Think, "Hot Henry from HR" or "Stinky Sally." (Just, uh, don't say it out loud.)

Get Active!

More blood pumping means more blood flowing to your brain. Studies have shown that just 20 minutes of physical activity per day can markedly decrease memory deterioration. This doesn't mean you have to become a triathlete to keep your brain power, but walking, dancing (which has the double benefit of increasing memory through activity and social interaction), and even sex can help keep you mentally fit.