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Contrary to popular belief, the human sense of smell can surpass many animals in specific tasks. Our noses excel at detecting the nuanced aroma of fine wine, and a remarkable olfactory skill even allows a woman to identify Parkinson’s disease before symptoms appear. When we’re around seniors, many notice a faint sweet, musty scent—often compared to old books—and science can explain why.

Scientists identify the “old people smell” as a normal by‑product of aging, largely due to the buildup of 2‑nonenal, an unsaturated aldehyde that carries a grassy, greasy odor. 2‑Nonenal forms during lipid peroxidation, a process in which oxidants attack polyunsaturated fatty acids secreted by the skin. The resulting compound is then metabolized by skin‑resident bacteria, releasing the characteristic scent of candle wax or aged pomade.

A 2010 study by the Japanese Society of Anti‑Aging Medicine found 2‑nonenal in 69 % of participants aged 40 and older, while younger volunteers showed none.

Can You Reduce the Aging Odor?

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Although a 2012 PLoS ONE study reported that most people do not find the 2‑nonenal odor off‑putting, many prefer to mask or reduce it. Simple deodorizing agents like baking soda can neutralize musty smells, but applying them all over the body is impractical.

University of Florida College of Medicine professor Dr. Dan Wesson explains that 2‑nonenal’s fatty nature makes it resistant to ordinary soaps and lotions. He recommends a strategy that combines nutrition and targeted skincare:

• Consume a diet rich in antioxidants—especially fruits and vegetables—to counteract oxidative stress.
• Use skincare products that contain persimmon extract. Research published in the Journal of the Japan Association on Odor Environment shows that the polyphenols in persimmon significantly reduce 2‑nonenal on the skin through their anti‑oxidative and deodorizing properties.
• Consider natural plant micronutrients found in green tea and oolong tea, which also possess similar benefits.

In short, while the aging odor is a natural biochemical change, an antioxidant‑rich diet coupled with persimmon‑infused skin care can effectively diminish its intensity.