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How much does our brain shrink by 70?

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Then, they analyzed the brain scans, looking at the size of seven regions associated with cognition. In the healthy group, age did not have a significant effect on brain size. In the other group, there was a large effect in all seven brain areas — older participants had significantly smaller brain areas than younger ones. read more

In general, brain volume will decline by 5% every 10 years after you 40 years old so it would be 15% shrink by 70 yo but there are difference rate in other areas. The rate of decline will increase after 70 years old..White matter of the brain declines faster than gray matter. read more

The human brain is big, and it's powerful, able to dream up innovative solutions to complex problems. Yet our brains don't age well: As we grow older, they tend to shrink and become increasingly vulnerable to cognitive dysfunctions such as memory loss and dementia. read more

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Are brains shrinking to make us smarter?
Source: phys.org