Aging of Hair

The 2005 document examines the process of hair aging, which includes changes to the hair shaft and follicle, leading to graying and decreased hair production in conditions like androgenetic alopecia (AGA) and senescent alopecia. It identifies both intrinsic factors, such as genetics, and extrinsic factors, like UV radiation and smoking, as contributors to hair aging, with oxidative stress playing a significant role. The paper discusses treatments for AGA, including topical minoxidil, oral finasteride, and hair transplantation, as well as the use of hair colorants for graying. It notes that AGA affects a significant portion of the population, with at least 50% of men by age 50 and up to 70% later in life, and 6% of women under 50, increasing to 30-40% at age 70. The document also explores the negative effects of smoking and UV radiation on hair health and emphasizes the importance of public awareness. Additionally, it reviews hair care recommendations for aging hair, such as frequent shampooing, shorter hairstyles, and intensive conditioning treatments, and highlights ongoing research into new hair care formulas and potential "anti-aging" compounds for hair and scalp care.