Try this out gives you your brain age , mine came 7 years below my actual age.
Must be all the nagging from the wife ,keeps me on my toes coming up with excuses all the time.
1. Touch 'start'
2. Wait for 3, 2, 1.
3. Memorize the number's position on the screen, and then click the circle from
the smallest number to the biggest number.
4. At the end of game, the computer will tell you the age of your brain.
http://flashfabrica.com/f_learning/brain/brain.html