http://mymentalage.com/
Mine is 41 (in contrast, I'm only 17). What's your mental age?
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I got 44 when I'm only 17. I think this is due in part to the extremely limited and also narrow test choices. Not a single one had the options I would've chosen, except the person falling I'm the street. Also, that test was so British it left me with this terrible thirst for tea. "That driver was probably a wanker."