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Skin cells live about two or three weeks. Colon cells have it rough: They die off after about four days. Sperm cells have a life span of only about three days, while brain cells typically last an entire lifetime (neurons in the cerebral cortex, for example, are not replaced when they die). There's nothing special or significant about a seven-year cycle, since cells are dying and being replaced all the time.
The brain does most of its development in the first 20 years of life, but new evidence suggests that it continues to develop, even into old age as long as it gets plenty â¦ of mental 'exercise'.