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What human glands normally shrink after age 5? Understanding the thymus, adenoids, and pineal gland

In a remarkable display of the body's adaptive nature, some organs, including glands crucial for childhood immunity, begin a programmed decline after their peak utility. So, **what human glands normally shrink after age 5**? The most prominent examples are the adenoids and the thymus gland, which decrease in size as the immune system matures.