What is the best explanation for "Photoaging"?

"Photoaging" refers specifically to the premature aging of the skin that results from prolonged exposure to ultraviolet (UV) radiation, leading to changes in the skin's structure and appearance. The correct answer emphasizes that long-term UV overexposure significantly damages the skin's elasticity, which is a key factor in maintaining youthful skin. This damage manifests as wrinkles, fine lines, and sagging, as UV rays break down collagen and elastin fibers in the skin.

The other options do not accurately capture the essence of photoaging. While genetics can play a role in skin aging, photoaging is directly linked to sun exposure and is not the result of genetic factors alone. Indoor tanning is a contributor to photoaging, but it is not the sole cause, as natural sunlight exposure also plays a significant role. Furthermore, stating that photoaging occurs only in the summer overlooks the fact that UV exposure can happen year-round, regardless of the season, especially during outdoor activities or through exposure to UV rays from artificial sources.