Genetics: A person's genes will dictate how quickly their hair will grow. Sex: Male hair grows faster than female hair. Age: Hair grows fastest between the ages of 15 and 30, before slowing down.
Asian hair is also the fastest growing, at over half an inch per month. Caucasian hair can be stick straight, wavy, or curly. The follicles have a slight oval shape, making it quite dense with an average hair growth of just under half an inch a month.
The female hormone estrogen causes the cycle to remain in stage one for a longer period, causing women's hair to grow longer than men's.” 3)
Testosterone is the most potent of the male hormones. Testosterone stimulates hair growth on the face and body. Generally, the more testosterone, the faster and coarser body and facial and body hair will grow. Beginning at puberty, and often accelerating during the 20's, total body hair increases in men.
Genetics: A person's genes will dictate how quickly their hair will grow. Sex: Male hair grows faster than female hair. Age: Hair grows fastest between the ages of 15 and 30, before slowing down.
Many hair follicles stop producing new hairs. Men may start showing signs of baldness by the time they are 30 years old. Many men are nearly bald by age 60.
Both men and women generally have hair growth of about half an inch per month. In a year, that is around 6 inches.
Hormones called androgens, which are present in both sexes, stimulate body hair (known as vellus hair) to darken and coarsen. Men have higher levels of androgens than women, so their body hair tends to be more prolific.
Scientists think that the build-up from years of producing testosterone disrupts the cycle of hair growth in men. As a result, the hair in some places grows longer before it falls out. That's why older men need to keep trimming eyebrows, nose hair and ear hair!
Men develop more androgenic hair than women because we have more androgens. Androgens (sometimes referred to as male sex hormones because we more of them than women) are sexual hormones such as testosterone, androstenedione and DHT, which create male characteristics. This, of course, includes being hairier.
It's caused by excess hormones called androgens. For women, the hair may grow in places where men often have a lot of hair, but women often don't. This includes the upper lip, chin, chest, and back. It can run in families.
The evolutionary perspective on hair
Experts believe that the reason long hair is more attractive is the evolutionary one. In short, it is believed that the length of a woman's hair represents her body's ability to have children. In turn, this makes female fertility one of the markers of human beauty.
Asian hair shows the fastest growth rate in comparison to the other two hair types. African hair has the lowest growth rate. Hair growth rate and hair diameter were reported to be associated with cuticle interscale distance.
Myth 4: Pubic hair never stops growing
Pubic hair stops growing when it reaches a certain point. The length at which it halts varies from person to person, but it stops between 0.5 to two inches. So don't worry ladies, pubic hair is not going to keep growing forever!
The 60-year old woman is in the news again for she is continuing to hold the record. Now the length of her hair extends to a whopping 110 ft. Asha Mandela began to grow her hair about 40 years ago when she moved to New York, USA.
Like so many things, it comes down to a mixture of genetics and hormones. We know that at least some of the genes for hairiness are carried on the X chromosome – and the way these genes are expressed varies between different men and ethnic groups – but hairiness also correlates with high testosterone levels.
The excessive hair growth in young teens usually happens due to high levels of male hormones called androgens. Androgens derive from testosterone, and all females have some androgens naturally. Both the ovaries and adrenal glands produce them, but they can cause excessive hair if they over-produce the hormones.
We now know that baldness is caused by a potent break-down product of testosterone, dihydrotestosterone (DHT). In the womb, the hormone plays an important role in the development of male genitalia. In susceptible adults, it makes hair follicles shrink.
The quick answer to “does trimming hair make it grow faster” is no, it doesn't. Hair growth starts at the scalp, so trimming off the dead ends doesn't actually make it grow faster. However, it makes it grow healthier, which is crucial if you want long luscious hair.
The African hair is generally curly or frizzy, and grows almost parallel to the scalp. It has the slowest growth rate of 0.9 centimeters per month due to its spiral structure which causes it to twist on itself as it grows.
Most hair strands grow at an average rate of about 0.3 to 0.4 mm a day. So, this means it may grow up to one-tenth of an inch or a little more in a week. However, this growth differs with people.