Intrinsic aging is primarily influenced by which factor?

• A. External sun exposure
• B. Dietary choices
• C. Genetic factors
• D. Personal habits

Answer: (C)

Intrinsic aging reflects the body's internal timetable, driven by genetic programming. This genetic control sets how skin cells behave over time, including how quickly collagen and elastin degrade, how well moisture is retained, and how cell turnover slows. Those internal factors establish the baseline rate of aging, largely determined by one's genes. External sun exposure accelerates aging through photoaging, causing wrinkles and pigment changes more rapidly than intrinsic aging alone. Dietary choices and personal habits influence skin health, but they mainly affect aging through modifiable external influences rather than the inherent pace set by genetics. So, genetic factors are the primary influence on intrinsic aging.