Purpose: The main objective of this study was to investigate and compare the memory quotient among active and inactive elder men (60-75) in Arak province. Materials and Methods: This research is ex-post facto type and 76 old men were selected as the sample of the study. All of the information was obtained through a Wechsler Memory Scale (WMS) and two other researchers made questionnaires for collecting the personal data and the state of physical activity among the sample. Validity was determined by Cronbach's Alpha method (α= 0.751). Subjects who completed the physical activity questionnaire were divided in to active and inactive groups. And for verifying their memories WMS was used. This questionnaire was able to evaluate the following items: General memory, Orientation, Mind control, Logical memory, Repeating the numbers, Visual memory and Associational learning. After gathering and collecting the data, the independent-sample t test with the significance level of 0.05 was used for evaluating the hypothesis. Results: The results with 95% certainty and meaningfulness of p
