The science behind the 'senior smell': Age, genetics, and 2‑nonenal
Older people often emit a specific odour mistakenly associated with poor hygiene. Scientists have discovered the true source of this smell.
Many elderly individuals emit a musty or greasy scent. Contrary to common beliefs, this is not due to neglect of hygiene. Researchers have identified the chemical compound 2-nonenal as the main cause of this aroma. It forms as a result of the oxidation of fatty acids in the body. As the skin ages, it becomes more susceptible to these processes, intensifying the odour.
Why do older people emit a specific odour?
A team led by Dr. Shinichiro Haze demonstrated that 2-nonenal is responsible for the distinctive smell, which is not a sign of uncleanliness in the elderly. Since this compound is not water-soluble, even frequent washing does not entirely remove it, as research confirms.
Dr Haze also discovered that the odour of older individuals may have roots in genetic heritage. Ancestors used it to assess age or health status. Although it is perceived negatively today, it once served an essential informational function.
Not all older people smell the same
Research shows that not all elderly people emit this specific odour. Only half of the study's participants had noticeable levels of 2-nonenal. Those who don't have it shouldn't worry; those who do have it shouldn't have any reason to be ashamed.
While standard hygiene methods cannot eliminate the "senior smell," there are ways to reduce it. A healthy lifestyle plays a key role. Reducing stress, maintaining a nutritious diet, regular physical activity, and avoiding stimulants such as cigarettes can help reduce the intensity of the odour.
It's also important to remember that the odour of older individuals, although often perceived negatively, is part of our natural biology. It is a matter of physiology and a testimony to evolutionary processes. Treating this scent as a regular aspect of ageing can lead to a better understanding of seniors' needs, among other things.
