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Which endocrine gland atrophies during adulthood?: The Thymus Gland

The thymus is the body's fastest-aging organ, according to a 2023 article from the *Harvard Gazette*. A peculiar and normal biological process, the age-related shrinking of the thymus gland is known as thymic involution. This phenomenon answers the question of **which endocrine gland atrophies during adulthood**, playing a crucial role in the body's immune function during childhood before being largely replaced by fat and connective tissue in later life.