I'm 43 - now that I know that the ability to create random numbers could be an indication of having a heathy or youthful brain, I know have enough knowledge to fake this test.<p>If I'm ever asked to provide a string of random numbers by a cognitive scientist or a doctor, I'll be certain to do my best and then apply external randomness to my individual guesses.<p>For example, I'll take the last phrase the scientist says to me - "please give me list of five random numbers from one to 10 ", and I'll apply the number of letters in each word of the sentence to each of my individual numbers and then modulo the answer to fit the range.<p>That way, with my old-age-cleverness, I'll hopefully be able to simulate a 25 year old.