Top: distribution p(fi, A) for the 20 most significant age-related features over 10 age categories. Below: visual examples of features (white circles) in subject image slices over age. Pairs (4, 8) and (1,19) represent symmetric white matter patterns appearing at slightly different onsets. (7) and (9) represent distinct modes cerebellar anatomy linked with vermian development and occurring exclusively in early life. (13) occurs in the brain stem across the age range, more frequently in early life. Note the lack of visible white matter under 100 days, e.g. corpus callosum.