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What age does the thymus involute and why does it happen?

The thymus, a crucial immune organ, begins to involute, or shrink, as early as the first year of human life. This gradual and universally observed process, known as thymic involution, is a significant marker of immunosenescence, the age-related decline of the immune system. Understanding **what age does the thymus involute** sheds light on the progressive changes to our body's defense mechanisms.