"'By the time we're even 20, we've filled it up,' he said, adding that the only way to add information after that point is to 'repurpose our neocortex to learn something new.'"
What exactly does that mean? I'm well past 20 and constantly learn new things. If I'm "repurposing my neocortex" every time I do it, it seems to be working as intended I guess?