Hair Thinning After 40: What Actually Helps?

As we age, time starts to take its toll. Wrinkles deepen around the corners of our eyes, our backs are more prone to aching as we get out of bed, and our hair often starts to lose its youthful fullness. If you’ve noticed that you’ve turned 40 and all of a sudden your forehead starts to look a little more prominent and your scalp begins to show up where there once were lush strands, you’re not alone.  

Over the course of our lifetime, hair loss will affect 80 percent of men and nearly half of women.  For many people, age 40 marks a turning point, when the earliest signs of thinning start to become noticeable. So how “normal” is the look of hair loss as we get older, exactly? And what can you do to improve the look of fuller, thicker strands as we age?  

The good news is that there are new science-based treatments in the form of platelet-derived exosomes that are clinically proven to help hair look thicker and fuller. Even better, the Mayo Clinic doctors behind ( plated )® Skin Science have discovered a way to formulate these renewing exosomes in a shelf-stable formula, HAIR Serum, that requires just 1–2 applications per day and dries in minutes with an undetectable finish.  

Read on to understand how “normal” the look of hair loss is as we get older. And what we can do to improve the look of fuller, thicker strands as we age.  

Is it Normal for Hair to Start Thinning After 40 for Men and Women?  

Yes, it’s very typical for hair to start thinning after age 40. In fact, for men, thinning hair during this decade of life is more common than not. According to the National Council on Aging, as many as two-thirds of men experience some hair loss by the time they reach their 40th birthday. By age 50, nearly 85 percent of men will notice their hair starting to fall out. 

Women’s hair loss is often less talked about, but it’s actually very normal for women over 40, too. Hair loss is often triggered by hormone changes, including perimenopause and menopause, and by age 50, four out of 10 women will suffer from thinning hair.   

How Can I Tell If My Hair Is Falling Out  

A healthy scalp is home to around 100,000 to 150,000 strands of hair, 50 to 100 of which fall out every single day. Daily shedding is a part of a circular growth cycle in which hair follicles naturally transition from the anagen (growth) phase to the catagen (shedding) phase to the telogen (resting) phase and back to anagen. As old hairs shed, new ones are constantly growing back in to replace them.  

Hair loss happens when shedding outpaces growth. This is usually defined as 150 more hairs falling out every day and the technical term is alopecia. Since it’s nearly impossible to count shedding hairs, if you’re worried that you might be experiencing hair loss, experts suggest looking for visible signs like a widening part or more exposed temples.   

Common Signs of Hair Loss  

If you think you might be experiencing hair loss, but can’t tell if it’s in your head, check for these telltale signs:  

• More hair in the shower drain or brush. You might not see clumps coming out, but there’s consistently more there to fish out of the drain or clean out of your brush than usual.  
• Increased shedding during routine activities. You start to notice more strands on your pillow, clothing, bathroom counter, or desk throughout the day. 
• Wider or more visible part over time. This can be especially noticeable in photos. 
• Temples appear thinner. You may notice the area around your temples looks more transparent with more skin showing through than before. 
  
• Scalp feels sensitive or tender. Feel tingling? That’s telling you something. An early sign of hair loss is often tightness, itching, or a tingling sensation in the scalp.   
  
• Hair grows more slowly. If it feels like ages since you’ve had your last haircut or trim, but your hair doesn’t feel overgrown, this could be a sign of hair loss.  
  
• Individual hair strands feel thinner. Many people don’t realize that during hair thinning, the individual strands often get thinner, too.  
  
• Parts look wider. If you see more visible skin on your part, that’s a sign. Many people often spot this first in overhead or bathroom lighting. Also you might notice yourself changing the position of your part instinctively to fake fullness.  
  
• Hairline looks uneven or receded. More skin showing at the temples is a classic marker of a receding hair line, but the changes can be more subtle like small gaps or patchy density along a once-defined line.  
  
• More scalp “peek-through” when hair is wet. Hair naturally clumps together when wet, but if you’re noticing significantly more scalp showing than it used to, especially at the crown or along your part, that can signal decreased density. 
  

If several of these signs sound familiar, you may be experiencing hair loss. The earlier you pay attention to subtle shifts in shedding, density, or scalp changes, the sooner you can take proactive steps to support healthier, fuller-looking hair. 

Why is My Hair Thinning After 40? 

Just like skin develops fine lines and dark spots over time, hair also shows visible signs of aging. And because your scalp is skin, it undergoes many of the same biological changes. As we age, the systems that keep skin and hair functioning optimally begin to slow down. 

Inflammation increases. Senescent cells, sometimes called “zombie cells,” accumulate and send disruptive signals. Structural proteins like collagen and elastin degrade. Together, these shifts impact the scalp environment and the hair follicle itself, leading to thinner, slower-growing, less resilient strands. 

The exact trigger for hair thinning in your 40s varies from person to person. Here are some of the most common reasons hair begins to shed or lose density: 

Hormone shifts for women: Starting in pre-menopause, estrogen levels begin to drop. This hormone is a main driver of the hair growth phase (or anagen phase), which is why many women in menopause notice that their hair doesn’t feel as thick as it used to.  

Hormonal shifts for men: As men age, changes in how their bodies process hormones, especially the conversion of testosterone into DHT, can affect hair growth. Some hair follicles become more sensitive to DHT over time, which causes them to gradually shrink. As follicles shrink, hairs grow thinner and shorter, eventually leading to visible loss. 

Nutrient deficiencies: Hair relies on essential vitamins and nutrients to grow and we're not getting enough, it impacts our scalp. As we get older, several factors can interfere with nutrient intake. Appetite may decrease, digestion becomes less efficient, stomach acid levels can drop, which affects the absorption of nutrients like vitamin B12, iron, and calcium. 

Stress and life changes: It might sound a little woo-woo, but science shows that stress in our lives can cause stress in our bodies. Chronic stress (think work or family life issues) can build up over time and lead to hair thinning. Major life events that are common after 40: divorce, career changes, moving, the transition to empty-nesting, and more.    

Science-Backed Ways to Improve the Look of Thinning Hair   

Thinning hair is normal after 40, but that doesn’t have to be your reality. There are more ways than ever to help hair return to its lush, full-looking state. Consider these science-backed ways to improve the look of thinning hair.  

1. Platelet-Derived Exosomes  

One of the most groundbreaking new treatments is platelet-derived exosomes. Exosomes are nano-sized molecules produced naturally by our bodies (in this case our platelets) that help the look of our skin and hair renew and refresh. However, they decline as we age.  

With more than 2 trillion platelet-derived exosomes in every bottle, ( plated ) Skin Science HAIR Serum is a scientific breakthrough, clinically proven to make your hair look fuller, stronger, and thicker. In peer-reviewed studies, HAIR Serum has been found to reduce the appearance of thinning, shedding, and breakage. This topical daily treatment delivers powerful nutrients to the scalp to increase the appearance of density, thickness, and fullness.  

What makes exosome-powered HAIR Serum unique is that it has been proven to help hair look thicker and fuller for both men and women who have experienced the appearance of hair loss through different causes. In fact, in a 9-month clinical study, 100 percent of participants say visible improvement in scalp coverage, while 96% showed an improved appearance of volume and fullness. The research showed that on average people experience a 3x increase in the appearance of hair density.  

One major perk: the formula has an invisible-dry finish and a weightless feel. After you apply the serum to your scalp, you can style with no drips, oils, or residue.

See some examples of real before-and-afters of patients using HAIR Serum, and find even more here. 

2. Gentle Hair and Scalp Care  

Sometimes improving the look of thinning hair starts with preventing unnecessary stress on your strands. Tight hairstyles, excessive heat styling, harsh chemical treatments, and aggressive brushing can weaken hair and contribute to breakage and even cause permanent hair loss in the form of traction alopecia. Choosing looser styles, minimizing heat, and detangling gently helps preserve strand integrity.  

3. Anti-Inflammatory Lifestyle Habits  

Chronic inflammation can impact follicle function over time. Stress, poor sleep, smoking, and highly processed diets may contribute to a scalp environment that’s less supportive of thick, resilient hair. Science shows that adopting anti-inflammatory habits like prioritizing sleep, managing stress, and following a healthy diet rich in fruits and vegetables can help over time. 

4. Correct Nutrient Deficiencies  

Your scalp health is sensitive to nutrient gaps. Iron deficiency, low vitamin D, inadequate protein intake, and zinc deficiency are all linked to increased shedding and reduced density. If a deficiency is present, correcting it can significantly reduce shedding and improve the look of fullness over several months. Testing with a healthcare professional is key: supplementing only helps when levels are truly low, and targeted correction is far more effective than guesswork. 

The Bottom Line  

Hair thinning after 40 may be common, but today’s science offers far more than a wait-and-see approach. Platelet-derived exosomes help address that change at its source, delivering the same renewal-supporting particles your body already uses to maintain healthy hair, just in a more concentrated, targeted way.

By supporting scalp renewal, exosome-powered treatments encourage the appearance of thicker, fuller, more resilient hair for both men and women. When paired with consistent use and other science-backed care habits, platelet-derived exosomes represent one of the most effective, easy ways to improve how hair looks as it ages. 

Frequently Asked Questions About Hair Thinning After 40 

How do platelet-derived exosomes help the look of thinning hair? 

Platelet-derived exosomes are microscopic particles your skin naturally uses to support the look of renewal and repair. As we age, exosomes decline. Topical treatments formulated with concentrated platelet-derived exosomes like HAIR Serum help support the scalp, encouraging the appearance of thicker, fuller, more resilient hair. 

Can hair thinning after 40 be reversed? 

Hair thinning after 40 is common, but in many cases it can be visibly improved. While some age-related changes are natural, science-backed treatments can support the scalp environment and help hair look  

Why does hair thinning often start around age 40? 

Around this age, hormonal shifts, increased inflammation, slower cell turnover, and changes in the scalp’s structure begin to impact hair follicles. Because the scalp is skin, it undergoes many of the same aging processes, affecting how well hair grows, anchors, and renews. 

How long does it take to see results from exosome-based hair treatments? 

Because hair grows in cycles, visible improvement takes time. Many people begin noticing reduced shedding and improved scalp coverage within a few months, with fuller-looking results continuing to build with consistent daily use over six to nine months. 

Do platelet-derived exosomes work for both men and women? 

Yes. Clinical studies show that platelet-derived exosomes can improve the appearance of hair density, volume, and scalp coverage in both men and women. 

Will a topical hair serum make my hair greasy or hard to style? 

HAIR Serum is designed to dry quickly with a lightweight, invisible finish, allowing you to style your hair as usual without residue, oils, or buildup. 

SOURCES 

Weir, D., Wyles, S., Behfar, A., Eaton-Jankov, L., Secic, M., Bell, M., Vyas, K., & Rohrich, R. J. (2025). Human Platelet Extract (Plated) Hair Serum for Hair Health Improvement: A Double-blind, Placebo-controlled Clinical Study. Plastic and reconstructive surgery. Global open, 13(3), e6562. 

https://nyulangone.org/news/most-men-experience-hair-loss-it-isnt-inevitable 

https://www.ncoa.org/article/hair-loss-statistics/ 

https://pmc.ncbi.nlm.nih.gov/articles/PMC4573453/