MYTH. There is no significant difference in the growth rate of scalp hair in men and women. On average, women and men’s scalp hair grow approximately half an inch every month. Even if individual differences in growth rate are accounted for, these are considered too marginal to reach a definite finding.
Sources:
•https://www.livescience.com/42868-how-fast-does-hair-grow.html
•https://www.hairfinder.com/hair4/man-hair-growth.htm