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Which of the following is categorized as an intrinsic factor for skin aging?

  1. Pollution

  2. Sun exposure

  3. Genetics

  4. Skincare routine

The correct answer is: Genetics

Intrinsic factors for skin aging are those that are determined by an individual's genetics and cannot be controlled. Pollution and sun exposure are environmental factors that can contribute to skin aging, but they are not considered intrinsic as they are external forces. Skincare routine is a personal care habit that can impact skin health, but it is not an inherent factor and can be modified. Genetics, on the other hand, are determined by an individual's DNA and are not able to be changed. Therefore, the correct answer for an intrinsic factor of skin aging is genetics (answer choice C).