Why Men Get Hairier With Age (Everywhere Except Your Head)
Posted
By Tom Henkenius · Updated October 2026
The science behind runaway eyebrows, mysterious forehead hairs, and the increasingly strange places men grow hair as they age.
At some point in your 40s, your body makes a curious decision. Your ears begin growing hair. Your eyebrows apparently receive a generous new funding package. And your back goes Sasquatch. Meanwhile, the hair on top of your head—the hair you actually want—starts to leave.
I've recently started trimming my eyebrows. Not because I'm particularly meticulous about them, but because I've developed an unusual talent for going to bed with two perfectly normal eyebrows and waking up with one or two hairs that seem to have grown overnight.
I'm beginning to think I have a shot at a world record. Though I've got some catching up to do. One Guinness World Records holder grew an eyebrow hair so long he reportedly tucked it behind his ear to keep it out of his mouth while eating.
As it turns out, there's some fascinating science behind why men seem to get hairier in increasingly unexpected places as they age.
And it largely comes down to two things: hormones and genetics.
Testosterone gets most of the attention when we talk about male hormones. But its more potent relative, dihydrotestosterone (DHT), also plays an important role in hair growth.
Here's the interesting part: Not all hair follicles respond to these hormones the same way.
Some are highly sensitive. Others barely respond at all. That helps explain why one guy can grow a magnificent beard but has almost no chest hair, while another looks like he's wearing a sweater underneath his shirt.
The research has also cleared up something else: Getting hairier doesn't necessarily mean your testosterone is increasing.
I have a cousin with whom I share a peculiar family trait. We each grow a single, unusually long hair in the middle of our foreheads.
Not in our eyebrows. Not at our hairlines. Somewhere in that otherwise unremarkable stretch of real estate between the two.
Exhibit A: The mysterious Henkenius forehead hair.
We pluck it. It comes back.
And remarkably, it appears in pretty much the same place on both of us.
Thank you, Grandpa Henkey.
Your genes help determine where hair follicles develop, how sensitive they are to hormones, and what kinds of hairs they produce.
Occasionally, a single follicle produces a hair that's noticeably longer, thicker, or darker than its neighbors. And plucking that hair doesn't ordinarily destroy the follicle. So, after a period of recovery, it can produce another hair. In exactly the same spot.
Now, I can't prove that my cousin and I inherited some extraordinarily specific forehead-hair gene. But the family resemblance is certainly suspicious.
But as we age, some eyebrow follicles can behave differently, producing hairs that become unusually long, thick, or coarse. Researchers believe hormonal influences and age-related changes in follicle behavior contribute, although the exact mechanisms aren't fully understood.
And there's something particularly irritating about the phenomenon. It's rarely the entire eyebrow. It's one hair. One ambitious, overachieving hair that has apparently decided the normal rules no longer apply.
And if you're wondering whether you should pluck it or trim it, trimming is generally the gentler option. Repeated plucking can irritate the skin and potentially damage follicles over time.
A small pair of grooming scissors or an eyebrow trimmer can handle most of these little surprises.
Why Do Men Grow More Ear Hair as They Age?
Eyebrows aren't the only facial hairs that become more adventurous with age.
Interestingly, this can happen even as testosterone levels gradually decline. So developing more ear hair doesn't necessarily mean your testosterone is surging. It may simply mean those particular follicles are responding differently as you age.
For all of us, a little maintenance goes a long way.
This transformation is especially familiar during puberty, but androgen-sensitive body hair can continue developing into adulthood. That helps explain why your back might become noticeably hairier long after your beard has reached its full potential.
And just as with ear hair, a hairier back doesn't necessarily indicate higher testosterone levels. Your genes and the sensitivity of individual follicles have a lot to say about the outcome.
So, Can You Do Anything About It?
Absolutely.
But first, it's worth making an important distinction.
There's nothing inherently wrong with body hair.
Some men like a hairy chest or back. Others prefer a smoother appearance. Neither is more hygienic, more masculine, or objectively better groomed. It's personal preference.
Whether you trim it, shave it, wax it, or leave it alone, the choice is yours.
Shaving cuts hair at the surface, leaving a blunt tip that may feel coarser as it grows back. It doesn't change the follicle or increase the hair's growth rate. But it'll poke you!
One final note: Gradual changes in body hair are usually nothing to worry about. But sudden, dramatic, or otherwise unusual changes deserve a conversation with a healthcare professional.
The Bottom Line
The older I get, the more I appreciate that grooming isn't really about fighting aging. It's about adapting to it.
You spend your 20s figuring out how to style your hair.
You spend your 30s figuring out how to keep it.
And somewhere along the way, you discover that grooming now involves parts of your body you never previously considered.
The good news? You don't need an elaborate routine to stay ahead of it.
A decent pair of scissors or trimmer, a good mirror, and about 30 seconds of attention can handle most of these new developments.
Just remember: Getting older doesn't mean giving up on looking good.
It just means occasionally checking your ears before leaving the house.
And About That Hair on Your Head…
We've spent plenty of time talking about the hair you're growing in places you never expected. But what about the hair you'd actually like to keep?
If your hairline is retreating or your hair is getting thinner, we've got some reading for you.
Mostly hormones and genetics. Hair follicles differ in how strongly they respond to androgens like DHT, and over the years some follicles on the ears, eyebrows, and back can shift from producing fine vellus hairs to thicker, darker terminal hairs. Which follicles do that is largely inherited.
Does more body hair mean higher testosterone?
Not necessarily. Testosterone generally declines gradually with age, yet many men get hairier anyway. How sensitive individual follicles are to hormones, and your genes, matter more than your testosterone level.
Why do my eyebrows get longer as I get older?
Eyebrow hairs normally have short growth cycles, which keeps them short. With age, some eyebrow follicles start behaving differently and produce hairs that are unusually long, thick, or coarse. Hormonal influences and age-related changes in the follicle likely contribute, though the exact mechanism isn't fully understood.
Should I pluck or trim long eyebrow hairs?
Trim them. Repeated plucking can irritate the skin and may damage follicles over time. A small pair of grooming scissors or an eyebrow trimmer handles stray hairs in seconds.
Is it bad to trim nose hair?
Trimming the visible hairs is fine. Removing all of it isn't a good idea, because nose hair helps trap larger airborne particles before they reach your respiratory system. Avoid plucking, which can irritate follicles and occasionally cause infections.
Does shaving make hair grow back thicker?
No. Shaving cuts hair at the surface and leaves a blunt tip that can feel coarser as it grows out, but it doesn't change the follicle or speed up growth.
Why does one long hair keep growing back in the same spot?
A single follicle can produce a hair that's longer, thicker, or darker than the ones around it. Plucking it doesn't usually destroy the follicle, so after a recovery period it grows another hair in exactly the same place.
When should I see a doctor about new body hair?
Gradual changes are usually nothing to worry about. Sudden, dramatic, or otherwise unusual changes in hair growth are worth a conversation with a healthcare professional.
We buy our own inventory. Nobody pays for placement, and we don't take affiliate commissions on anything you read here. Here's the whole explanation in two minutes.
Why Men Get Hairier With Age (Everywhere Except Your Head)
By Tom Henkenius · Updated October 2026
The science behind runaway eyebrows, mysterious forehead hairs, and the increasingly strange places men grow hair as they age.
At some point in your 40s, your body makes a curious decision. Your ears begin growing hair. Your eyebrows apparently receive a generous new funding package. And your back goes Sasquatch. Meanwhile, the hair on top of your head—the hair you actually want—starts to leave.
I've recently started trimming my eyebrows. Not because I'm particularly meticulous about them, but because I've developed an unusual talent for going to bed with two perfectly normal eyebrows and waking up with one or two hairs that seem to have grown overnight.
I'm beginning to think I have a shot at a world record. Though I've got some catching up to do. One Guinness World Records holder grew an eyebrow hair so long he reportedly tucked it behind his ear to keep it out of his mouth while eating.
As it turns out, there's some fascinating science behind why men seem to get hairier in increasingly unexpected places as they age.
And it largely comes down to two things: hormones and genetics.
Quick Guide
First, Blame Your Hormones
Testosterone gets most of the attention when we talk about male hormones. But its more potent relative, dihydrotestosterone (DHT), also plays an important role in hair growth.
Here's the interesting part: Not all hair follicles respond to these hormones the same way.
Some are highly sensitive. Others barely respond at all. That helps explain why one guy can grow a magnificent beard but has almost no chest hair, while another looks like he's wearing a sweater underneath his shirt.
The research has also cleared up something else: Getting hairier doesn't necessarily mean your testosterone is increasing.
In fact, testosterone levels generally decline gradually with age.
And that brings us to genetics.
Your Family Has a Lot to Answer For
I have a cousin with whom I share a peculiar family trait. We each grow a single, unusually long hair in the middle of our foreheads.
Not in our eyebrows.
Not at our hairlines.
Somewhere in that otherwise unremarkable stretch of real estate between the two.
We pluck it. It comes back.
And remarkably, it appears in pretty much the same place on both of us.
Thank you, Grandpa Henkey.
Your genes help determine where hair follicles develop, how sensitive they are to hormones, and what kinds of hairs they produce.
Occasionally, a single follicle produces a hair that's noticeably longer, thicker, or darker than its neighbors. And plucking that hair doesn't ordinarily destroy the follicle. So, after a period of recovery, it can produce another hair. In exactly the same spot.
Now, I can't prove that my cousin and I inherited some extraordinarily specific forehead-hair gene. But the family resemblance is certainly suspicious.
Why Do Eyebrows Get Longer With Age?
Back to the eyebrows. I found this fascinating. Normally, eyebrow hairs have relatively short growth cycles. That's why they don't grow continuously like the hair on your head.
But as we age, some eyebrow follicles can behave differently, producing hairs that become unusually long, thick, or coarse. Researchers believe hormonal influences and age-related changes in follicle behavior contribute, although the exact mechanisms aren't fully understood.
And there's something particularly irritating about the phenomenon. It's rarely the entire eyebrow. It's one hair. One ambitious, overachieving hair that has apparently decided the normal rules no longer apply.
And if you're wondering whether you should pluck it or trim it, trimming is generally the gentler option. Repeated plucking can irritate the skin and potentially damage follicles over time.
A small pair of grooming scissors or an eyebrow trimmer can handle most of these little surprises.
Why Do Men Grow More Ear Hair as They Age?
Eyebrows aren't the only facial hairs that become more adventurous with age.
Dermatologists recognize that ear hair can become more prominent in older men, likely because of a combination of hormonal influences and individual follicle sensitivity.
Interestingly, this can happen even as testosterone levels gradually decline. So developing more ear hair doesn't necessarily mean your testosterone is surging. It may simply mean those particular follicles are responding differently as you age.
For all of us, a little maintenance goes a long way.
Should I Trim My Nose Hair?
Nose hair deserves a little respect.
Those hairs serve a purpose: They help trap larger airborne particles before they travel farther into your respiratory system.
Which means that while trimming visible nose hair is perfectly reasonable, removing all of it isn't a particularly good idea.
And plucking can irritate follicles and occasionally cause infections.
Better to trim than pull.
Why Does Back Hair Increase With Age?
And finally, there's the back.
For some men, back and shoulder hair becomes increasingly noticeable with age.
The explanation brings us back to hormones and genetics. Much of your body is covered in tiny, fine hairs called vellus hairs. Under the influence of androgens, some follicles can begin producing thicker, darker terminal hairs.
This transformation is especially familiar during puberty, but androgen-sensitive body hair can continue developing into adulthood. That helps explain why your back might become noticeably hairier long after your beard has reached its full potential.
And just as with ear hair, a hairier back doesn't necessarily indicate higher testosterone levels. Your genes and the sensitivity of individual follicles have a lot to say about the outcome.
So, Can You Do Anything About It?
Absolutely.
But first, it's worth making an important distinction.
There's nothing inherently wrong with body hair.
Some men like a hairy chest or back. Others prefer a smoother appearance. Neither is more hygienic, more masculine, or objectively better groomed. It's personal preference.
Whether you trim it, shave it, wax it, or leave it alone, the choice is yours.
And no, shaving doesn't make your hair grow back thicker. That's one of grooming's most persistent myths.
Shaving cuts hair at the surface, leaving a blunt tip that may feel coarser as it grows back. It doesn't change the follicle or increase the hair's growth rate. But it'll poke you!
One final note: Gradual changes in body hair are usually nothing to worry about. But sudden, dramatic, or otherwise unusual changes deserve a conversation with a healthcare professional.
The Bottom Line
The older I get, the more I appreciate that grooming isn't really about fighting aging. It's about adapting to it.
You spend your 20s figuring out how to style your hair.
You spend your 30s figuring out how to keep it.
And somewhere along the way, you discover that grooming now involves parts of your body you never previously considered.
The good news? You don't need an elaborate routine to stay ahead of it.
A decent pair of scissors or trimmer, a good mirror, and about 30 seconds of attention can handle most of these new developments.
Just remember: Getting older doesn't mean giving up on looking good.
It just means occasionally checking your ears before leaving the house.
And About That Hair on Your Head…
We've spent plenty of time talking about the hair you're growing in places you never expected. But what about the hair you'd actually like to keep?
If your hairline is retreating or your hair is getting thinner, we've got some reading for you.
What actually works for hair loss (and what I learned from a $1,300 red light helmet) → Deep dive: Hair Loss vs. Thinning Hair: Which Shampoo Actually Works → Shop hair loss and thinning →Body hair and aging, answered
Why do men get hairier as they age?
Mostly hormones and genetics. Hair follicles differ in how strongly they respond to androgens like DHT, and over the years some follicles on the ears, eyebrows, and back can shift from producing fine vellus hairs to thicker, darker terminal hairs. Which follicles do that is largely inherited.
Does more body hair mean higher testosterone?
Not necessarily. Testosterone generally declines gradually with age, yet many men get hairier anyway. How sensitive individual follicles are to hormones, and your genes, matter more than your testosterone level.
Why do my eyebrows get longer as I get older?
Eyebrow hairs normally have short growth cycles, which keeps them short. With age, some eyebrow follicles start behaving differently and produce hairs that are unusually long, thick, or coarse. Hormonal influences and age-related changes in the follicle likely contribute, though the exact mechanism isn't fully understood.
Should I pluck or trim long eyebrow hairs?
Trim them. Repeated plucking can irritate the skin and may damage follicles over time. A small pair of grooming scissors or an eyebrow trimmer handles stray hairs in seconds.
Is it bad to trim nose hair?
Trimming the visible hairs is fine. Removing all of it isn't a good idea, because nose hair helps trap larger airborne particles before they reach your respiratory system. Avoid plucking, which can irritate follicles and occasionally cause infections.
Does shaving make hair grow back thicker?
No. Shaving cuts hair at the surface and leaves a blunt tip that can feel coarser as it grows out, but it doesn't change the follicle or speed up growth.
Why does one long hair keep growing back in the same spot?
A single follicle can produce a hair that's longer, thicker, or darker than the ones around it. Plucking it doesn't usually destroy the follicle, so after a recovery period it grows another hair in exactly the same place.
When should I see a doctor about new body hair?
Gradual changes are usually nothing to worry about. Sudden, dramatic, or otherwise unusual changes in hair growth are worth a conversation with a healthcare professional.
What we read
Eighty-one year old Chinese man has longest eyebrow hair in the world — Guinness World Records, 2016
Excessive hair — DermNet
Hair — Cleveland Clinic
Ear hair — Cleveland Clinic
Nose hair — Cleveland Clinic
Does shaving make hair grow back thicker? — Mayo Clinic
How we work
We buy our own inventory. Nobody pays for placement, and we don't take affiliate commissions on anything you read here. Here's the whole explanation in two minutes.