While we love and honor our elders, we also recognize that aging comes with more than just wisdom.

The physical changes that occur as we grow older extend far beyond appearance — and one of the most noticeable is a distinct body odor often associated with elderly individuals.

Commonly referred to as “old people smell,” this term isn’t exactly flattering, but science has confirmed that the scent is real. Most of us have encountered it before: a musty aroma with hints of oil or grease, almost as if it comes directly through the pores.

You might notice it in a relative’s home, in nursing facilities, or standing in line at the supermarket. Despite what some may think, it has very little to do with personal hygiene.

What Causes the Odor?

Researchers say the odor is linked to a compound known as 2-nonenal. As people age, hormonal shifts trigger an increase in fatty acids on the skin. At the same time, antioxidant levels decrease, leaving those fatty acids vulnerable to oxidation — a process that results in higher levels of nonenal.

This compound can cling to the skin even after bathing and tends to be most noticeable around the chest and back.

Illness and certain medications may intensify the scent as well. A 2001 study published in the Journal of Investigative Dermatology found that older adults had greater concentrations of nonenal trapped in their clothing.

Can Humans Detect the Scent Automatically?

A 2012 study suggested that humans may subconsciously recognize the scent of older individuals. Much like animals, people might be able to pick up cues about someone’s age or general health status based on their odor alone. This instinct may even be tied to an ancient connection to our ancestors.

In Japan, this smell has a specific name — kareishu — and several companies have developed products aimed at reducing or eliminating it. Perfumes, body washes, and other deodorizing items are marketed to help neutralize the scent, with persimmon extract believed to remove it from the skin entirely.

Ways to Reduce the Odor Naturally

Exercise supports metabolism, which can help regulate hormones and lower stress — both of which may lessen the intensity of the odor. Regularly laundering clothes is also important, as nonenal can accumulate in fabrics more easily than expected, making frequent washing necessary.

Maintaining a healthy diet rich in antioxidants and staying well-hydrated can benefit the skin, too. Dehydration not only dries out the skin but can also worsen odors coming from both the body and mouth.

Proper hygiene helps, but sometimes the simplest solution is to let fresh air circulate through the home.

Aging With Grace and Compassion

Growing older is unavoidable, and changes in our bodies are a natural part of life. What should never fade, however, is the compassion, love, and respect we show to the elderly.

Does this familiar smell bother you? Were you surprised to learn there’s a scientific explanation behind it? And what are your thoughts on specialized products designed to reduce nonenal?