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Brain Loss

Eventually, our brain stops growing because some of our brain cells start dying and are not replaced. After age 18, a person may lose more than 1000 brain cells each day.

Question: If your brain has more than 100 billion brain cells by age 18, how long will it be at the above "loss rate" before your brain runs out of cells?

Source: James Meyers' The 2nd Big Book of Amazing Facts (1982)