Men after 50 years old eyebrows long long may be related to genetic factors, may also be related to the body’s hormone secretion level and nutritional status. 1. Genetic factors. Hair growth rate and the degree of density are related to heredity, for the family has a long eyebrow crowd, their children’s offspring will be significantly higher chance of long long eyebrows. 2. Hormone secretion level. Hair growth is greatly affected by hormone secretion levels, when the body’s hormone secretion is more vigorous, the growth rate of eyebrow hair will increase, so it is easy to appear the phenomenon of long eyebrows. 3. Nutritional status. Eyebrow hair belongs to a kind of normal hair, its growth process also needs a lot of nutrients, in the case of good nutritional status, the growth rate of eyebrow hair will also be appropriately faster. Since there are many reasons for this, you need to consult a doctor for a specific case.