According to immunity theory, ageing is due to

Accumulation of errors

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Reduced functioning of endocrine glands

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Degeneration of thymus

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Accumulation of waste products

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Solution

The correct option is C Degeneration of thymus

According to immunity theory, the immune system is programmed to decline its functions over time, and this fact is the main cause of aging. Thymic involution (shrinking of the thymus with age) is believed to be the main age-related change in the immune system, and this alteration begins after puberty.
So, the correct option is ‘Degeneration of thymus’.

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