Phototrichogram Analysis of Normal Scalp Hair Characteristics with Aging

November 2013 in “ European Journal of Dermatology ”

Jung Eun Kim, Juhyun Lee, Kwang Hyun Choi, Won Soo Lee, Gwang Seong Choi, Oh Sang Kwon, Moon Bum Kim, Chang Hun Huh, Chull Wan Ihm, Young Chul Kye, Byung In Ro, Woo Young Sim, Dowon Kim, Hyung Ok Kim, Hoon Kang

phototrichogram hair density hair thickness white hair pattern hair loss scalp hair

TLDR Hair gets thinner and grayer with age, and density decreases more in men on top and in women on top and back.

The study, which included 674 males and 683 females aged between 10 and 69 years from a South Korean population, used phototrichogram analysis to examine the characteristics of normal scalp hair across different age groups. It found that hair density decreased with age, especially at the top of the scalp for males and between the top and back for females, while hair thickness generally increased until the 20s, plateaued until the 50s, and then decreased after the 50s. The percentage of white hair significantly increased in individuals over 40 years old. No gender differences were observed in mean hair density or thickness. The study also provided PT data and hair parameter ratios that could assist in diagnosing pattern hair loss. The research was funded by the Korean Dermatological Association and reported no conflicts of interest.

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