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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.
These days, a consensus of neuroscientists agree that brain development likely persists until at least the mid-20s â possibly until the 30s. The fact that our brains arenât developed until the mid 20s means that âlegal adultsâ (those age 18+) are allowed to make adult decisions, without fully mature brains.