This is a fun challenge. It's in Japanese and English, and I do not vouch for its accuracy.

Click Start; wait for the 3, 2, 1. Then it will show you some numbers--be warned, they are shown VERY briefly--which are then replaced by blank circles. You click on the circles where the numbers were, from lowest to highest. No allowance for correcting!

Brain age

Em--I scored 29, 34, then 29 again. Can't seem to get seven in the time they give you to memorize.