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This study investigated whether impulsivity measured in 12‐14‐year‐olds could predict problem gambling in late adolescence, above and beyond other personality factors such as aggressiveness and anxiety. A prospective‐longitudinal design was used, thus overcoming limitations of past studies which used concurrent or retrospective designs. The sample included 154 boys living in economically deprived neighborhoods. Impulsivity measures comprised self‐reports, teacher ratings and laboratory tasks, and were administered during early adolescence. Gambling behavior was assessed at age 17 using a self‐report measure. Early gambling behavior and socio‐demographic information were also collected for control purposes. Results revealed that a self‐report measure of impulsiveness and a card‐sorting task significantly predicted problem gambling, even …