In the present study a survey was performed in order to investigate if the use of heuristics in decision-making has an influence on the impulse buying tendency. Another aim of the study was to see if there were any age differences with regard to the use of heuristics and the impulse buying tendency. The study was conducted with students from Göteborg University and Karlstad University in Sweden (n = 69), with different educational backgrounds. Participants filled out a booklet of questions divided in two parts. One part measured impulse buying tendencies, and the second part measured the use of heuristics in decision-making. One hypothesis was that impulse buyers would use heuristics to a higher degree than planned buyers. It was also hypothesized that young participants would be more impulsive buyers because they use heuristics more than older participants. The results gave no support to the hypothesis that impulse buyers would use heuristics to a higher degree than planned buyers. Support for the second hypothesis was received as 20-24 year old high achievers on the heuristics test were found to be significantly more impulsive buyers than low achievers in the same age group.