Correlations between age, T1w/T2w, and diffusion metrics averaged across nodes in the arcuate fasciculus and frontoparietal SLF. M, Male; F, female; FP SLF, frontoparietal superior longitudinal fasciculus. Gray shading represents 95% CI. A, B, Age was significantly negatively correlated with T1w/T2w in both the left arcuate (nodes 73–88) and left frontoparietal SLF (1–11). C, D, Age was not correlated with FA in the left arcuate (nodes 73–88) but was significantly positively correlated with MD in the left frontoparietal SLF (nodes 1–11). E, F, T1w/T2w was not correlated with FA in the left arcuate (nodes 73–88) but was significantly positively correlated with MD in the left frontoparietal SLF (nodes 1–11).