Define ageing. Mention any three theories of ageing.

Ageing is a complex biological process that involves the gradual decline in the structure and function of cells, tissues, and organs over time. It is characterized by a progressive reduction in the body's ability to maintain homeostasis, repair cellular damage, and adapt to environmental changes. Ageing is ______ _________ ________ ________ _______ ______ _____ ____ _________ ________ ___ _________.
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