Probably a lot older than that, I forget what day it is sometimes.
Edit: Am I just supposed to click the numbers in increasing order?
well done!

Probably a lot older than that, I forget what day it is sometimes.
Edit: Am I just supposed to click the numbers in increasing order?
Cant seem to get below 20... got to stop playing now. got 24 first go then 20, 20 , 20 must stop! Real age 29
Is in Japanese, but easy to understand anyway...
Link
There are more game at the bottom,
Link
and
Link
Edit: The third one you will can change to English at the start screen.
Link - Pick the one that is different...
Edit 2: At the end it shows the brain age, and apparently the ideal age for a brain is 20.... according to Dr Kawashima - Link