Mean shear stiffness μ properties of SGM structures (Ca, Caudate; Pa, Pallidum; Pu, Putamen; Th, Thalamus) for young and older adults, in standard MNI space. μ of these structures remain significantly different between age groups after correcting for ROI volume, with all being softer in older adults. *** denotes p < .001 and ** denotes p < .01 significance levels. Abbreviation: SGM, subcortical gray matter; ROI, region of interest.