Why are male eyebrows thicker in old age?

Do you often wonder why older men have shaggy eyebrows while they are losing scalp hair? Scientists have conducted a series of studies on the issue and have come to some interesting conclusions.

Eyebrows_ thick_of_ a_senior

According to them, it is indeed the specific influence of androgens on the organism of men and women.

Hair densification in old age: the scientific reasons

According to scientists, the hair growth of older men is influenced by high levels of testosterone until old age. Dermatologist Danilo Del Campo indicates that over time, these hormones become more pronounced in the hair follicles. In women during this time, estrogen production, which causes hair growth, declines after menopause.

In this sense, the International Journal of Molecular Science even published a review in 2020. However, note that the speed of hair growth, texture and color are influenced by several factors. These include genetics, nutrition, age, health, and sex of the subjects involved.

Note, however, that hormones and different responses differ between men and women as they get older.

How does eyebrow hair grow?

Body hair grows from hair follicles in a well-defined life cycle. The latter includes three phases namely: anagen (growth phase), catagen (transition phase) and telogen (dormancy phase). Also called the exogenous phase, it is during the latter that the hair ends up falling from the head.

However, Dr. Del Campo points out that the length of the hair cycles on different parts of the body differs. As an indication, the hair of the scalp has a long growth phase varying between two and seven years. When it comes to other hair sites like the eyebrows, the realities are very different.

For this one in particular, the anagen phase lasts about a month which is followed by a prolonged rest phase. That is why their size often does not exceed 1 cm.

The role of testosterone in the body

The more men age, the more the androgen level in their body increases as opposed to that of women who undergo regression. During puberty, testosterones are responsible for the growth of hair on the face, arms and back. Over time, some follicles become more sensitive to androgens, which maintains their anagen phase even more.

This is the phenomenon that affects hair sites such as the eyebrows, ears and nose. In contrast, hair follicles on the scalp react differently to testosterone. This hormone has the effect of shortening their level of growth. It is this complex phenomenon that explains the appearance of shaggy eyebrows, long nose hair and a bald head in old people.

The dermatologist specifies, however, that growth takes place until they reach the age of 70. In women, on the other hand, the hair production cycle of women regresses from the age of 50.

Source: Livescience

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