Nearly everyone has some hair loss with aging. The rate of hair growth also slows. Hair strands become smaller and have less pigment. So the thick, coarse hair of a young adult eventually becomes thin, fine, light-colored hair.
"Your hair bundles peak at around 12 years old." Then, sadly, as you age, bundles of four become bundles of three, bundles of three become bundles of two, and it's all downhill from there. End result: hair appears thinner and less full.
Your estrogen levels recently changed.
When estrogen levels are high, hair tends to be thicker than usual; When they're low, it can cause hair loss, says Joshua Zeichner, M.D., director of cosmetic and clinical research in dermatology at Mount Sinai Hospital in New York City.
As we age, our prolonged exposure to testosterone starts to play a visible role on other body hair as well. Just like it transforms the vellus hair on a young man's face into a thick beard, it also changes the nearly invisible hair that grows in places like our ears into thicker strands.
Men all have roughly the same amount of testosterone. Certain genes make your hair follicles more or less sensitive to the amount of testosterone in your body. Basically, an enzyme converts testosterone into a substance that shrinks hair follicles.
Nearly everyone has some hair loss with aging. The rate of hair growth also slows. Hair strands become smaller and have less pigment. So the thick, coarse hair of a young adult eventually becomes thin, fine, light-colored hair.
More than 90% of Han Chinese, 70% of Japanese and Thai people, and 60% to 90% of Native Americans carry the “thick hair" version of the gene. Meanwhile it's almost nonexistent in people of African and European descent. Both age and sex can also affect your hair shaft thickness.
It's all in your genes
The Hair Growth Cycle works in three stages but can vary a little from person to person therefore some people will appear to have a fuller head of hair depending on how long their hair grows before entering the shedding stage of the hair growth cycle.
By the time you turn 30, you have a 25% chance of displaying some balding. By age 50, 50% of men have at least some noticeable hair loss. By age 60, about two-thirds are either bald or have a balding pattern. While hair loss is more common as you get older, it doesn't necessarily make it any easier to accept.
At what age do people typically start to lose their hair? Hair loss can start as early as your teenage years or might not occur until you're well past retirement. Generally, people begin noticing signs of hair loss in their 30s and 40s. More significant hair loss often happens when people reach their 60s and beyond.
In women, hereditary hair loss usually starts after the age of 40. Roughly 40% of women have noticeable hair loss by the age of 50. And less than half of women get through life with a full head of hair.
Hair will generally be at its best in the early 20s, says Burg, because “hair shafts are thick and cuticles are tight.” Women may see changes if they are stressed, extreme dieting or using contraception.
Type 1B hair is thicker – it is still very straight, but has medium texture so it has more volume. Hair that is type 1C is very thick and coarse, but still straight and shiny so it can be hard to make curls last. Type 2 hair is naturally wavy, with more curl than some types of hair but less than others.
Hair growth rate slows at midlife and beyond—it spends less time in the growth phase and more in the resting phase, which means it will grow more slowly, and won't be able to grow as long as it once did. Good news—wonder-drug minoxidil can make your hair stay in the anagen phase longer and grow faster.
Hair growth can often be traced to testosterone, a potent male hormone. Both sexes produce testosterone in their bodies, but to different degrees, of course. Testosterone stimulates hair growth on the face and body. Generally, the more testosterone, the faster and coarser body and facial hair will grow.
The “awkward stage” occurs when you have decided that you no longer want short hair and you will instead grow it out. Everyone's awkward stage is a bit different depending on their styles, but inevitably, you will find that your hair looks shaggy, uneven, or simply messy at some point in the process.
To measure for hair thickness, pluck a strand of hair from your head, ideally from a spot that is pretty full, so avoid any face framing pieces, and compare the strand to a sewing thread. If your hair is as wide, or just slightly under width, as a sewing thread, then you have thick hair.
Caucasians have the highest hair density among the ethnicities studied. Black people have the lowest. Asian people have hair density that falls somewhere in between.
When it comes to the race that tends to lose the most hair, that goes to Caucasians. Additionally, West Asian (specifically Indian) people are likely to experience similar hair loss levels to Caucasians.
One popular myth is that hair loss in men is passed down from the mother's side of the family while hair loss in women is passed down from the father's side; however, the truth is that the genes for hair loss and hair loss itself are actually passed down from both sides of the family.
Lifestyle factors could include using certain hair products, wearing your hair up too tightly, experiencing high stress levels, or not getting enough of certain vitamins and minerals in your diet. People who have immune system deficiencies could also have thinning hair.