To examine whether the ability to control impulsive response differs by age or intelligence of impulsive children, the Matching Familiar Figures (MFF) test was administered under the instructions emphasizing the reflective responding to high- and low-IQ groups of impulsive fourth-graders and to a group of impulsive first-graders. In the high-IQ group of fourth-graders errors on MFF significantly decreased and latency time significantly increased in accordance with the direction of the instructions, while in the low-IQ group errors significantly decreased without showing increase in latency time. Among the first-graders, neither errors nor latency time changed. It can be said that older impulsive children can control their impulsive response toward the reflective direction, even in the absence of prior training.