Data collection method: pencil and paper cognitive test for general cognitive functioning. Computer-based test for assessment of memory skills. fNIRS data collected with fNIRS device Oxymon MK III, and analyzed with Oxysoft software and Matlab. Resource and metadata language: English Data collection: August 2017 - June 2018 Behav_Data: RBANS = Repeated Battery for the Assessment of Neuropsychological Status (completed by older adults exclusively); STeMX = Spatial-Temporal Memory test: task 1 (category: fruits) - task 2 (category:clothes) - task 3 (category: animals) - task 4 (category: vegetables); SpatialLocX = Order of recall based on Spatial position (8 possible locations); TempLocX = Order of recall based on Temporal position (8 possible locations). fNIRS_Data: DLPFC_X_OXY = oxygenated HbO concentration changes in X (right or left) dorsolateral prefrontal cortex (Brodmann area 46); aPFC_X_OXY = oxygenated HbO concentration changes in X (right or left) anterior prefrontal cortex (BA 10); mPFC_X_OXY = oxygenated HbO concentration changes in X (right or left) medial prefrontal cortex (BA 9); DLPFC_X_DeOXY = deoxygenated HHb concentration changes in X (right or left) dorsolateral prefrontal cortex (Brodmann area 46); aPFC_X_DeOXY = deoxygenated HHb concentration changes in X (right or left) anterior prefrontal cortex (BA 10); mPFC_X_DeOXY = deoxygenated HHb concentration changes in X (right or left) medial prefrontal cortex (BA 9); CBSI_46_X = Correlation-Based Signal Improvement (CBSI) corrected activation signal for BA 46 (dorsolateral prefrontal cortex); CBSI_10_X = CBSI-corrected activation signal for BA 10 (anterior prefrontal cortex); CBSI_9_X = CBSI-corrected activation signal for BA 9 (medial prefrontal cortex).