What classification applies to photoaging stemming from external factors like UV radiation?
Answer
Extrinsic aging
Photoaging is classified as extrinsic aging because its root cause originates from external environmental factors, most prominently ultraviolet (UV) radiation exposure from the sun or tanning booths. This contrasts sharply with intrinsic aging, which is dictated internally by uncontrollable factors such as genetics and the simple passage of time. Because extrinsic aging is driven by external sources, it is largely considered controllable through preventative measures. This form of aging contributes significantly to the visible signs of premature skin aging, often accounting for up to 90% of these visible changes, involving damage that sinks deep into the skin at the cellular level long before cosmetic signs become apparent.
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