From "The Incredible Shrinking Human Brain" on Psychology Today: "It is true that many of our parts wither as we age, our brains among them. Octogenarians are liable to have brains 15% smaller than Justin Bieber's brain. Imagine that! Humans it seems are unique among primates in that we are longest-lived with the largest brains, and are also susceptible to neuropathology in the late stages of life, such as dementia."
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