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A short explanatory video by Dr. Charles Mok summarizing how sun (UV) exposure contributes to facial aging. SPEAKER A explains that UV penetrates skin and affects facial fat cells — which the speaker states live about seven years and die via apoptosis — and that sun exposure impairs stem-cell–mediated replacement of fat cells, leading to net fat loss; bone demineralization with age also contributes to facial descent.
Questions this video answers
About seven years.










