Yes, our brain shrinks as we age. And vitamin B can help. But it's also important to remember that your brain is like a muscle. It needs exercise. And as with everything else, if you don't use it, you'll lose it. 
So here are some suggestions for keeping your brain in tip-top shape: 
- Try reading books on topics that are unfamiliar to you. 
- Join a book club or cooking class. 
- Play Brain Age on the DS gaming system. 
- Take up crossword puzzles, solitaire, Soduku, or jigsaw puzzles. 
- Start a collection of teacups, shells, postcards, or vintage toys. 
- Use your non-dominant hand for everyday tasks, such as guiding the mouse on the computer or brushing your teeth. 
- Start walking (yes, studies show physical exercise improves memory!) 
- Travel...it's amazing how much you'll learn by visiting a new place. 
- Take a foreign language class at the community college. 
- Take up meditation. 
- Rearrange all the drawers at home or at your office. 
- Try to learn one "new" word a day. 
- Use cash to pay for your purchases. 
- Put together a scrapbook. 
- Memorize a new song or poem. 
- Volunteer at an elementary school library. 
All these activities help to rebuild neural connections in your brain. And keep reading my Guide to Good Health. That's always a winner for your brain!