Evidence of reduced sensitivity to temporal information has been found in both dyslexia and aging research. On area of interest concerns the associations between sensitivity to motion and speed of processing among dyslexics and older groups. In this study the pattern of performance of dyslexic and control readers, and a group of older observers were investigated. Sensitivity to global motion and form, and performance accuracy on rapid counting tasks that required either simultaneous or sequential processing were obtained. The results showed that the older and poor reader groups were both significantly less sensitive on the motion task when compared to the controls. No significant between groups effects were found for the global form task. The poor readers and older groups were significantly less accurate than the control group when processing rapidly presented sequential information, with the older group only less accurate with presentation of simultaneously presented information. Evaluation of individual patterns of performance revealed that reduced sensitivity on the motion task better discriminated the older group, with performance on the rapid sequencing task better discriminating the poor reader group. The implications of these data for a sensory processing deficit in dyslexia and aging are discussed.