The ageing of the skin.
D000368:Aged; D000375:Aging; D003240:Connective Tissue Diseases / Q000209:etiology; D003677:Deficiency Diseases / Q000209:etiology; D005260:Female; D006801:Humans; D008297:Male; D008659:Metabolic Diseases / Q000209:etiology; D012871:Skin Diseases / Q000209:etiology*; D012878:Skin Neoplasms / Q000209:etiology; D012879:Skin Physiological Phenomena; D012883:Skin Ulcer / Q000209:etiology