At birth, the thymus is one to two inches long, one to two inches wide, and less than a half-inch thick. A child’s thymus has a pink-gray color, is soft to the touch, and has a lobulated surface. It keeps growing until puberty, where it typically reaches a weight of 40 to 50 grams. As a person ages, the process of involution causes the thymus to decrease in size to around five grams in elderly adults.

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