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Myth vs. Science: Does the human body change every 7 years?

While it's a popular belief, the human body does not change completely every 7 years; in fact, different cells have dramatically different lifespans. A 2005 paper using carbon dating suggested the average age of cells was 7 to 10 years, a key finding likely misinterpreted as a full-body replacement cycle. This article explores the science of cellular regeneration to debunk the myth and explain what actually happens as we age.