Roots of manually extracted scalp hairs among 86 healthy Koreans in different age groups were examined microscopically and the proportion of resting hairs to growing hairs were determined with the followings results. 1. The proportion of resting hairs in all age groups was 10.9% and there was no significant difference between male and female. 2. In each age group the proportion of resting hairs shows difference, being lowest(6.8%) in below 9 years age group, increasing the rate by increasing the age group, highest(19.7%) in over 60 years age group. 3. The proportion of resting hairs below the age of 29 years was below 10%, above 30 years to 49 years in between 10% to 15%, and over 50 years in between 15% to 20%. 4. The normal range of the proportion of resting hairs among normal Koreans was below 20%.