The Japanese Discovery Behind Old Person Smell: Why The Smell Won't Wash Off
The Japanese Discovery Behind Old Person Smell: Why The Smell Won't Wash Off
It isn't sweat, and it isn't hygiene. Here is what Japanese researchers found, why it survives every shower, and what finally breaks it down.
Here is the answer first, because you clicked for it.
That is why it's still on the pillow after a shower every single day. Why it's in the shirt collar, in the favorite armchair, on the blouse by evening. Japanese researchers put a name on it back in 2001. Most people dealing with it were never told.
The rest of this article is the part nobody explains: where it comes from, why everything you tried failed, and the quiet way people are finally getting rid of it.
"He just needs to shower more."
You've heard all of them.
"He just needs to shower more."
"It's part of getting old."
"Try a stronger deodorant."
So people do exactly that. They shower every morning. They switch to the antibacterial soap, then the scented body wash, then the body wash "for men." They buy the stronger deodorant, the new detergent, the cologne for his birthday. They wash the sheets twice a week.
And the smell is still there. Stale. A little greasy. Not there ten years ago.
If you're the one who notices it on someone you love, you know the other half of the problem: you can't say it. How do you tell your husband, your mother or your dad that it's them? You don't want to hurt their feelings. Bring it up, and he gets offended. So you open a window, light a candle, change the pillowcase again, and say nothing.
And if you're the one who caught it on your own blouse at the end of a long day, you know the half step back from a hug. You shower every morning. You did nothing wrong.
Nobody did. The advice was aimed at the wrong thing.
What Japanese researchers found
In 2001, a team at Shiseido's Product Development Center in Yokohama, Japan, published a study in the Journal of Investigative Dermatology (Haze et al., 2001).
They analyzed the body odor of people between the ages of 26 and 75. One compound stood out: 2-nonenal, which the researchers describe as having an "unpleasant greasy and grassy odor."
Not in the younger ones. The difference wasn't how often anyone showered. It was age.
The team also traced where it comes from. As skin gets older, the oils on its surface change. There are more of certain fatty acids, and more of the compounds that make them oxidize. When those fatty acids break down, 2-nonenal is what's left. The more of them on the skin, the more 2-nonenal in the body odor.
In plain English: after 40, the oil on your skin starts to turn, the way cooking oil does when it sits out. That stale oil is the smell.
Japan even has a word for it: kareishu. Over there, soaps are made specifically for it. Here, people are still being told to shower more.
Why the smell won't wash off
Sweat is mostly water. Regular soap and body wash are made for sweat and everyday dirt.
2-nonenal isn't sweat. It's oil-based, and it clings to the skin. Think of a greasy pan: plain water and a quick rinse just slide over it. You need something that actually breaks the grease down. Regular soap can't break nonenal down, so it stays on the skin. And from the skin, it goes everywhere the skin goes.
Once you know that, every place you've noticed it makes sense.
The pillow
Nonenal builds up on the back of the neck and behind the ears. That skin spends the whole night pressed into one piece of fabric. It's why the smell is worst in the morning, and why it comes back so fast after you change the sheets.
The shirt collar
Same skin, same oil, rubbing the same strip of fabric all day.
The favorite armchair
The headrest takes a little more every evening. That's how a spotless house ends up with that smell anyway. It quietly seeps into everything he sits and sleeps on.
The blouse by evening
Fresh after the morning shower. By the end of the day, the skin has made more.
And the hardest part: you can't smell it on yourself. Your nose tunes it out after a few minutes. You go nose blind. Everyone who hugs you, sits next to you in the car or leans in to talk still can.
Why everything you tried failed
Go back through the list. Every item on it is aimed at sweat, at bacteria, or at the air in the room. Not one is aimed at the oil.
- Showering more.More water over the greasy pan. It dries out the skin and leaves the nonenal where it was.
- Antibacterial soap.Nonenal doesn't come from bacteria. It comes from the skin's own oil breaking down. There is nothing to kill.
- Stronger deodorant.Deodorant goes under the arms. Nonenal builds up on the neck, behind the ears, on the chest and the back.
- Perfume, cologne, scented body wash.A scent on top of a smell. It covers it for an hour, and then you have both.
- New detergent, washing the sheets twice a week.The fabric comes out clean. The skin puts the oil right back that same night.
- Air fresheners, candles, the air purifier.They treat the room. The source walks back in.
It's not that you didn't try hard enough. You were handed tools made for a different problem.
The other half of the Japanese discovery: what breaks it down
If the cause is an oil, the answer isn't more washing. It's washing with something that goes after the oil.
Japan already had it. It's called kakishibu: the tannin from green persimmons. The fruit is picked once a year, before it ripens, when the tannin is at its strongest. Then it's crushed, pressed and left to ferment slowly, the way it has been done in Japan for centuries.
Picked once a year, then left to ferment slowly.
The tannin in fermented persimmon binds to nonenal and lifts it off the skin, instead of covering it with perfume.
That's why, on the forums where people take care of aging parents, the same answer keeps coming up from the ones who have lived it: persimmon soap.
But there's a catch. And it's the reason some people try a persimmon soap and still smell it on the pillow.
Most of the orange bars sold in America get their color from dye and their scent from perfume. A fragrance or a splash of fruit juice is cheap and quick. It smells nice in the box. It doesn't break down nonenal. The part that does the work, the fermented kakishibu, isn't in them.
The bar made with real fermented kakishibu
This is where Kiyomi comes in.
Kiyomi is a Japanese persimmon soap made with real fermented kakishibu. No synthetic dyes. No perfume to hide behind. It's a round, amber bar, and you can check it yourself at a window: real kakishibu lets the light through. Dyed soap doesn't.
Around the kakishibu are three things mature skin needs: shea butter, olive fruit oil and glycerin. Skin comes out soft instead of stripped.
It's made for the daily shower, for men and women alike. Lather it where nonenal builds up: the back of the neck, behind the ears, the chest, the back and the underarms. Leave it on for 30 seconds. Rinse. That is the whole routine.
See if the real kakishibu bar is still in stock.
Check Availability →60-day money-back guarantee, even if the bar is used upThe quiet way to get rid of his old man smell
Here is what makes this different from every other fix: nobody has to have the conversation.
You don't have to tell him. You don't have to find the words for your mother. You take the old soap out of the shower and you put this one in. That's all.
Then you watch the pillow.
And he never has to know it was the soap.
If it's your own blouse you've been checking, it's the same bar and the same two weeks. Hold it to your face at the end of a long day. It should smell like a clean blouse.
Check Availability →Rated 4.8 out of 5 by 100,000+ customers
"My son told me straight out: Dad, you smell like grandpa used to. I figured this was another gimmick. Two washes and it was off my skin and out of my collars."
"I bought it for my mom, she is 84. Her room used to have that smell no cleaning would fix. Within a week it was gone. She feels dignified again."
"I kept noticing a faint smell a fresh shower could not fix. I was skeptical but desperate. After one use the difference was remarkable. The odor is gone and stays gone."
"I read that after a certain age your skin starts to smell different, even freshly showered. I noticed it on myself. Two washes and it was gone."
Dramatized customer stories.
60 days to check your own pillow
If you're skeptical, good. You've probably already paid for soaps that did nothing.
So here is the deal. Use Kiyomi every day for 60 days. If the smell isn't clearly gone, send one email and you get every cent back, even if the bar is used up. No forms. No return shipping.
One bar lasts about 4 to 6 weeks with daily use. That means you can finish an entire bar, check the pillow, the collar and the blouse, and still ask for your money back.
If your own pillow doesn't convince you, you don't pay.
Check Availability →Try it for 60 days60% off and 2 free gifts
- 2 bars for $39 instead of $98. That's $19.50 a bar.
- 2 free gifts with the 2 bars: the exfoliating soap pouch and a mystery gift.
- Free shipping on the 2 bars, sent within 24 to 48 hours with tracking.
- Or 1 bar for $29 instead of $49.
Two things to know before you put this off:
- The Black Friday offer ends soon.
- Real kakishibu comes from one persimmon harvest a year, so every batch is small.
What to remember
It was never sweat. It was never hygiene.
It's 2-nonenal, an oil the skin only starts making after 40.
Regular soap, stronger deodorant and perfume were never made for it. That's why the smell won't wash off.
Fermented kakishibu binds to it and lifts it off in the shower.
And you have 60 days to check your own pillow, even if the bar is used up.
Nobody has to be told anything. You just switch the soap.
Check Availability →60% off + 2 free gifts · 60-day money-back guaranteeSource: Haze S, Gozu Y, Nakamura S, Kohno Y, Sawano K, Ohta H, Yamazaki K. "2-Nonenal newly found in human body odor tends to increase with aging." Journal of Investigative Dermatology. 2001 Apr;116(4):520-4. pubmed.ncbi.nlm.nih.gov/11286617