The description 'damage at the cellular or DNA level results in accumulation of mutations or incompetent cells' best matches which aging theory?

• A. Organismal aging
• B. Contextual aging
• C. Mechanistic aging / biological model
• D. Normative aging

Answer: (C)

Mechanistic aging explains aging as the result of progressive damage at the cellular and molecular level. When cellular components such as DNA, proteins, and other organelles incur damage, mutations can accumulate and cells can become incompetent or dysfunctional. Over time, this cellular deterioration leads to tissue and organ decline, which is the hallmark of aging in this framework. The statement about damage at the cellular or DNA level causing mutations and incompetent cells directly reflects this view. It differs from notions that focus on the organism as a whole, environmental or contextual factors, or typical age patterns across populations, which don’t specify the underlying cellular and molecular damage as the driving cause.