Abstract: Methods and systems that correlate between (i) the manner in which the end-user holds and utilizes a mobile electronic device, particularly in landscape mode versus portrait mode, and (ii) the age or age-range of the user. The system detects a fraudulent transaction when the user utilizes a banking application portrait mode, while the declared age of the user indicates that he is old. Furthermore, the minimum distance between (i) the on-screen point-of-interaction of the user on the touch-screen, and (ii) a particular edge of the touch-screen, is further utilized to determine the user's age or age range.