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A person's immune response is determined by the size of their thymus which produces T lymphocytes. The thymus begins to shrink after adolescense and at the age of 70 it is about 1/10 the size it was at the age of 10. Therefore, it is 25% as powerful as it was during adolescense.

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14y ago
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Q: Why does the strength of the immune response decline in the elderly?
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