“The myelin literally starts to split apart with age,” Bartzokis said. “This is why every old person you've ever met in your life moves more slowly than they did when they were younger. Their muscles haven't changed, but the speed of the impulses they can send to them has changed, because the myelin gets old.” The good news is that while natural waves of myelination end in our thirties, our overall volume of myelin increases until our fifties, and we always retain the ability to add more myelin through deep practice. “You must remember the myelin is alive, always being generated and
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