Abstract
Hair aging comprises weathering of the hair shaft and aging of the hair follicle. Aging of the follicle manifests as a decrease of melanocyte function or graying, and decrease in hair production in androgenetic and senescent alopecia. The study of hair aging focuses on two main streams of interest: the esthetic problem of aging hair and its management and also the biological problem of aging hair in terms of microscopic, biochemical and molecular changes. The scalp is subject to intrinsic or physiologic aging and extrinsic aging due to external factors. Intrinsic factors are related to individual genetic and epigenetic mechanisms with interindividual variation. Examples of genetic factors are familial premature graying and androgenetic alopecia. Extrinsic factors include UV radiation and smoking. The appearance of hair plays an important role in people’s overall physical appearance and self-perception. With today’s increasing life-expectancy, the desire to look youthful plays a bigger role than ever. The ...
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