I've found today one of those cool useless test... this one is to test your mental age. It also gives you your naive degree, your mature degree and your old degree. Here is the link: http://www.mbti123.com/mental/en/ P.S. To get the full result, you much click on the Share tab and then you click on the Details tab. I've got: Real age: 22 Mental age: 36 Naive degree: 44 Mature degree: 64 Old degree: 47 Share yours!