Longevity & AgingScientists Map Five Distinct Phases of Brain Rewiring Across the Human Lifespan
Researchers analyzed diffusion MRI brain scans from 4,216 individuals aged 0–90, applying 12 graph theory metrics and dimensionality reduction (UMAP) to map how structural brain network topology changes across life. They identified four major turning points at approximately ages 9, 32, 66, and 83, defining five distinct epochs: childhood, adolescence, adulthood, early aging, and late aging. Each epoch features characteristic shifts in network integration, segregation, and centrality. Networks become denser and more efficient through early adulthood, peak around age 29–32, then progressively lose integration while gaining segregation and local clustering in older age. The study highlights that brain development is fundamentally non-linear and multidimensional, and these turning points can only be revealed through a population-level, lifespan-wide, multivariate approach.
