“the fastest-shrinking regions were the orbitofrontal cortex and other parts of the brain that have expanded the most over the past few million years.”

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Link. Both humans and chimps have 17 brain regions. Some are similar size but a few are much larger in humans. They include decision-making systems that that get crappy in middle-aged humans.

There’s a hint these age faster than other regions. The result sounds squishy and nobody knows why — maybe we ask too much of these hacked together innovations.