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A short, single-speaker YouTube excerpt (by Dr. Charles Mok) explaining structural facial aging: progressive loss of facial bone mass, connective tissue, and localized facial fat. The speaker attributes localized facial fat loss partly to sun exposure preventing pre-adipocyte replacement of dying fat cells, leading to "skeletonized" appearance and hollowing (temples, under-eyes, jowls) and apparent soft-tissue descent due to volume deflation rather than skin elongation.










