However, this number is based on the count of thick hairs only, so if we count the fine hairs in between the thick hairs, the average number of hairs is said to be about 110,000. There are a lot more hairs in the hairs of the forehead than we thought.
By the way, it is not well known that the life span of a single hair differs between men and women. The life span of a male hair is 3 to 5 years, while that of a female hair is about 7 years, with female hairs lasting longer.
In men, a single hair falls out after only three or five years. Normally, new hairs grow back after the hairs fall out, but as a man becomes seriously ill or gets older, new hairs gradually stop growing. As this happens, more hair falls out than grows back, and the hair on the hairline gradually becomes thinner and thinner, and eventually the hair on the hairline grows bald. In the case of women, hairs on the hairline do not disappear so easily because the life span of hairs on the hairline is long.