The Wellbeing Edit

5 Surprising Facts About “Old Person Smell”

  • By Maurice E. Morales

Summary: Most people have heard of “old person smell.”

But very few know what it actually is, when it starts, or why normal hygiene may not stop it.

Here are 5 things worth knowing.

1. It Actually Has a Name: 2-Nonenal

“Old person smell” isn’t literally the smell of age.


Researchers have linked that distinctive greasy, grassy odor to a compound called:

2-nonenal.


It forms when certain oils on the skin break down through oxidation.


So there’s a specific compound behind the smell — not simply “age.”

2. It Can Start Showing Up Around the 40s

Not 70.

Not 80.


Research has found 2-nonenal can start showing up around the 40s.


Long before most people would ever think of themselves as elderly.

3. Daily Showers Don’t Prevent It

This isn’t simply a cleanliness problem.


A person can shower every day.

Use deodorant.

Wear clean clothes.


And 2-nonenal can still be produced on the skin.


That’s because it comes from changes in skin oils, not simply sweat or dirt

4. It Can Develop So Slowly That It Goes Unnoticed

2-nonenal doesn’t appear overnight.


It can build gradually over years.

And when a smell increases slowly, the nose can adapt to it along the way.


Scientists call this olfactory adaptation, or nose blindness.


So while the odor may be getting stronger, the brain can keep turning it down.

5. It’s Not Something People Have to Live With

2-nonenal is simply a compound the skin can begin producing with age.


And because researchers could identify what was behind the smell, they could look for something that actually worked on the problem itself.


That search led to something surprisingly simple.

CHECK NONENAL SOAP →

What Researchers Found

One ingredient became particularly interesting:

Persimmon.


A 2012 human study tested a persimmon-based soap over four weeks.


Researchers didn’t just ask whether people felt fresher.

They actually measured 2-nonenal coming from the body.


And after four weeks:

Measured 2-nonenal dropped significantly.


So the idea wasn’t simply to cover the odor with another fragrance.

It was to deal with the compound behind it.

Source: Mitro et al., PLOS ONE, May 30, 2012.

A Simple Daily Soap Swap

That’s the idea behind Nagomi Nonenal Soap.


It combines persimmon extract with green tea extract, while glycerin and hyaluronic acid help keep skin comfortable with regular use.

And there’s no added fragrance trying to cover the result.


No complicated new routine.


Just replace ordinary body soap and focus on the actual problem:

2-nonenal.

Nagomi Nonenal Soap

Made for 2-Nonenal & Aging Skin

CHECK NAGOMI AVAILABILITY →

60-Day Risk-Free Trial

There Is One Catch

Nagomi is produced in batches, and stock can run low when demand increases.


So for someone who would rather deal with that uncertainty before another person ever has to mention it...


It may be worth checking the current stock before this batch is gone.

CHECK NAGOMI AVAILABILITY →

References & Research

We believe readers should be able to check the research for themselves. Below are the primary scientific sources referenced in this article.
 

1. Haze S, Gozu Y, Nakamura S, et al. (2001).
2-Nonenal Newly Found in Human Body Odor Tends to Increase With Aging.
Journal of Investigative Dermatology, 116(4), 520–524.
This is the study that identified 2-nonenal in the 40+ participants studied and linked it with age-related changes in skin lipids.


2. Mitro S, Gordon AR, Olsson MJ, Lundström JN. (2012).
The Smell of Age: Perception and Discrimination of Body Odors of Different Ages.
PLOS ONE, 7(5), e38110.
This controlled study tested whether people could distinguish age groups using body odor alone.


3. Dalton P, Wysocki CJ. (1996).
The Nature and Duration of Adaptation Following Long-Term Odor Exposure.
Perception & Psychophysics, 58(5), 781–792.
Participants exposed to the same odor in their homes for two weeks became less sensitive to that specific odor — the phenomenon commonly described as “nose blindness.”


4. Tatsuguchi I, Matsuoka T, Izumi R, Ijichi S, Shibata H. (2012).
Preventive Effect Against the Aged Men’s Body Odor by the Soap Containing Polyphenol.
Journal of Japan Association on Odor Environment, 43(5), 362–366.
A four-week study of 20 men aged 43–75 found significant reductions in measured 2-nonenal and odor intensity after daily use of a soap containing a plant-polyphenol blend with astringent persimmon and tea extracts.


5. Goto T, Mimasu Y, Mimasu T. (2026).
History of Kakishibu—Before and After the Plastic Era.
In Traditional Knowledge for Green Innovation with Japanese Persimmon Tannin, Kakishibu.
This historical review describes traditional kakishibu use and documents the 1984 deodorizing experiments with astringent persimmon juice, later patented in 1991.


6. PubChem — 2-Nonenal.
U.S. National Library of Medicine / National Center for Biotechnology Information.
Used for physical-property information, including 2-nonenal being insoluble in water and soluble in fixed oils.

 

Editorial note: This article is for general informational purposes and is not medical advice. Individual body odor can have many causes, and persistent or sudden changes should be discussed with a healthcare professional.

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