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At what age is the human body fully mature? A comprehensive guide to physical and mental development

While many legal systems define adulthood at age 18 or 21, the biological reality is far more complex. Different physiological and neurological systems mature at different rates throughout the lifespan. This means the answer to the question, "At what age is the human body fully mature?" is not a simple number, but a dynamic process that continues long past our teenage years.