In subjects with normal auditory processing, the central auditory nervous system (CANS) supports the interpretation of poor speech signals by a process of intrinsic redundancy. Auditory closure is achieved, enabling the listener to ‘fill in the gaps’ when parts of the auditory signal are missing or partially unintelligible. Auditory processing disorder (APD) arises from a deficiency in CANS functionality, which reduces the individual’s ability to utilize intrinsic redundancies in listening circumstances with low extrinsic redundancy. Low redundancy speech tests (LRST) are a common method of evaluating an individual’s ability to fill in the missing components of speech signals. One such test is the University of Canterbury Adaptive Speech Test – Filtered Words (UCAST-FW; (McGaffin, 2007; O’Beirne, McGaffin, & Rickard, 2012; Rickard, Heidtke, & O’Beirne, 2013). While the UCAST-FW is sensitive enough to discriminate between children with and without APD (Rickard et al., 2013); the continuing maturation of the auditory cortex throughout childhood to adolescence means that clinical assessments of CAP must compensate for the effect of age on performance using correction factors (Wunderlich, Cone-Wesson, & Shepherd, 2006). The present study aimed to take steps towards clinical application for paediatric patients by investigating the impact of maturation on UCAST-FW as a function of age. 143 English speaking children, ranging from 6 to 12 years of age with normal hearing, were examined on their ability to discriminate speech items binaurally and monaurally on the UCAST-FW, along with questionnaires to provide information on potential predictor variables such as socioeconomic factors, ethnicity, and teacher evaluation of auditory performance (TEAP) score. Regression analysis found that participant age was the only variable to significantly predict binaural score (p = 0.001). A k-mean cluster analysis determined the age groupings that best defined the sample, and an ANOVA analysis of these groupings revealed a significant main effect of age on binaural scores F(2,106) = 5.7 8, p = .004, η² = .098, 1 - β =.86. Post-hoc testing revealed significant differences between the oldest and middle cluster (p = .026) and between the oldest and youngest cluster (p = .001), but not between the middle and youngest cluster (p = .19). These results support the existing understanding of the development of the CANS in children from infancy to adolescence.