AUTHOR=Ruitenberg Marit F. L. , Cassady Kaitlin E. TITLE=Commentary: Age Differentiation within Gray Matter, White Matter, and between Memory and White Matter in an Adult Life Span Cohort JOURNAL=Frontiers in Aging Neuroscience VOLUME=11 YEAR=2019 URL=https://www.frontiersin.org/journals/aging-neuroscience/articles/10.3389/fnagi.2019.00093 DOI=10.3389/fnagi.2019.00093 ISSN=1663-4365