New study shows age related differences in memory depend on age related grey matter integrity and the integrity of white matter connections.

Many of us experience memory problems as we grow older, but different types of memory change at different rates. A recent study from the Cambridge Centre for Ageing and Neuroscience (CamCAN; www.cam-can.org), led by MRC CBU researchers Rik Henson and Rogier Kievit, has shown how age-related differences in three types of memory depend on age-related differences in both the grey-matter integrity of key brain regions and the integrity of white-matter connections between them. 

http://www.nature.com/articles/srep32527