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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.
A red blood cell lives on average 120 days. It does not contain a nucleus or any other cellular organells for that matter, and it derives its own energy without using the oxygen it is carrying to the tissues.eport Abuse. A red blood cell lives on average 120 days. It does not contain a nucleus or any other cellular organells for that matter, and it derives its own energy without using the oxygen it is carrying to the tissues. To do so would make it very inefficient.