I agree it seems more likely that causation flows from aging to microbiome changes, not the opposite. When your skin ages, the biome changes as your barrier is

I agree it seems more likely that causation flows from aging to microbiome changes, not the opposite. When your skin ages, the biome changes as your barrier is degraded, as your skin thins, as inflammation increases as your immune system ages, and as the surface becomes rougher and more difficult to clean.