One of the biggest fears young people and young adults have is that, upon reaching a certain stage, they begin to smell like an old man or an old person. This can happen much sooner than anyone can imagine or expect. Today, we explain the reason why we reach this stage in our lives, how to detect when this phenomenon occurs, its causes, and also the correct way to counteract it. So don’t worry and learn something new.

What do we know about the molecule 2-nonenal?

2-nonenal is an organic molecule that belongs to the aldehyde family. Its full chemical name is “2-nonenal,” and its molecular formula is C9H16O. The chemical structure of 2-nonenal is characterized by an aliphatic chain of nine carbon atoms with an aldehyde functional group (CHO) at the end of the chain. Its chemical structure is represented as follows: CH3-(CH2)7-CHO

At what age do you start to smell like an old person?

According to data published in the journal Plos One, scientists revealed that the smell of old people begins around age 30 and is primarily due to two volatile organic compounds (VOCs): 2-nonenal and isovaleric acid. The characteristic cheesy smell of isovaleric acid is produced by the metabolism of sweat by bacteria in the skin tissue.

In Japanese culture, this aroma is called “Kareishu” due to 2-nonenal, which begins to be noticed around age 30 and is the characteristic smell of older people. It is generated by the oxidative degradation of unsaturated fatty acids and also affects epidermal balance and regeneration.

Important Characteristics and Uses of 2-Nonenal

Although this aroma is not entirely pleasant in humans, the molecule has several interesting applications, which we share below:

Aroma and Flavor: 2-Nonenal is known for its characteristic aroma and flavor. It is commonly described as a compound with a nutty odor and notes of rancid oil. This aroma and flavor have been identified in various foods and oils, and it is one of the molecules responsible for giving some foods their characteristic flavor profile.

Oxidation Reactions: 2-Nonenal is susceptible to oxidation, meaning it can react with oxygen in the air and change its aroma and flavor over time. This is especially important in the food industry, where rancidity of oils and fats can be a problem due to the formation of compounds like 2-nonenal.

Scientific Research: 2-Nonenal has also been the subject of research in the fields of sensory science and aroma and flavor chemistry. Its presence and contribution to the aroma and flavor of food have been studied in relation to sensory perception and food quality.

Science has confirmed the existence of “kareishu,” a Japanese term referring to the smell of an elderly person, a phenomenon that occurs much earlier than commonly thought.

How do we perceive it? Humans have the ability to identify the age of other individuals through their scent. This characteristic scent of older people is due to a molecule called 2-nonenal, present in the skin.

What is the exact age at which it appears?

This is the main question many people ask, as we are all concerned about the possibility that we will reach a certain age and not even realize it. We would like to inform you that various studies have found that, although it is erroneously associated with old age, “kareishu” can begin to be perceived as early as the age of 30, becoming more evident as we age.

Why does it occur?

2-Nonenal is generated by the natural oxidation of fatty acids in the skin’s lipid barrier. This process intensifies with age due to:

This is due to hormonal changes, as lipid production on the skin’s surface decreases.

There is also a decrease in antioxidant capacity; the skin loses its natural ability to fight free radicals.

How can you control it?

Although “kareishu” is a natural process, there are measures to control it and reduce its intensity:

1. Personal hygiene:

Shower daily with neutral soap.

Use deodorants and perfumes regularly.

Pay special attention to areas prone to bacterial buildup, such as armpits and feet.

2. Diet:

Eat a diet rich in fruits, vegetables, and antioxidants.

Limit the consumption of processed foods and foods rich in saturated fats.

3 Hydration:

Drink plenty of water to keep your skin hydrated.

4 Physical Activity:

Exercise regularly to promote blood circulation and eliminate toxins.

5 Specific Products:

Use creams and soaps specifically designed to combat body odor.

Remember that the scent of aging is a natural part of aging.

If you’re concerned, you can implement the measures mentioned above to control it.

Consult a dermatologist if body odor bothers you or if you notice unusual changes in your skin. Take care of your skin and enjoy every stage of life.