
New York Times
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βDuring an extended period of travel last year, my husband and I lent our house in the Ozarks to an older couple who were having work done on their own house. We returned after a month away to a spotless house and two hostess gifts. But there was also a distinctive smell in the air: slightly stale and sweet, like the musty first whiff of strawberries in a cardboard box. I wiped countertops and mopped floors. Still, the odor remained. Not terrible but strange and cloyingly human. Late that night I guiltily googled, βDo older adults smell?β The answer I found was yes. Then no. And maybe β¦ I mentioned my question to a group of women writers, ranging from 40 to 70, and got drastically different responses. The younger women said yes, thereβs an odor associated with aging. But to the older women it sounded like ageism and a few took offense. At 52, I felt a little prickly about it myself, but also in need of information. If there was anything I could do to improve my personal scent, now and in the future, I wanted to know. So I consulted two scientists from a renowned research lab and ran into the very same split. Johan Lundstrom, a 46-year-old biologist with the Monell Chemical Research Center, says his studies confirmwhat Japanese researchers found in 2001: An unsaturated aldehyde called 2-nonenal is more concentrated on the skin of older adults, often producing a distinctive grassy, waxy or fatty odor. Dr. Lundstromβs study affirmed the existence of βolder adults smellβ but stated that on average participants found it βneutralβ and βnot unpleasant.β He believes the odor is perceived as negative largely due to context. Itβs similar, Dr. Lundstrom says, to the smell of fresh manure: Smelled in a stable, itβs perceived as natural. But in oneβs bedroom it becomes disturbing and bad. βIn the Japanese study, when researchers did not tell participants what the odor was, they rated it as βinoffensive,ββ Dr. Lundstrom says. βBut when they said it was from an old person, it was rated as βnasty.ββ The bias in Japan is clear. They have a name for older person odor β kareishu β and it has a definitively negative association. A Japanese company called Mirai Clinical sells a $16 persimmon soap bar that promises to eliminate the βoffensiveβ smell. Dr. Preti distrusts the science of the 2001 study. βI was 57 when the original Japanese study came out and I remember being quite offended,β he said. βThe group they sampled as being βoldβ included people in their 40s. Thatβs insane.β Dr. Lundstrom endorsed the Japanese findings but was leery of the industry around kareishu; he said expensive creams and soaps will not provide a fix. βSmell has a very large subconscious component,β Dr. Lundstrom said, βso masking it will not do any good. Each odor binds to a particular chemical receptor in the nose and this information will travel even through heavy perfume.β Nonenal and its sweeter-smelling cousin, nonanal, are aldehydes that were discovered in the 1920s. Theyβve been used in small concentrations by the scent and flavor industries ever since. βItβs possible you find these aldehydes more in Japanese populations than in Americans,β he said. (Dr. Preti also proposed that Japanese subjects might have higher levels of nonenal from eating fish.) βBut Iβm almost 80 years old and Iβve spent my life in odor research. If someone told me I had a particular smell I wouldnβt take offense, Iβd want to do something about it.β A new method for odor masking may provide the key. Dr. Warren works with an Illinois-based company called Belle Aire Creations that has developed technology to bind a chemical masking product with a distinctive odor, forming a larger molecule that is nonvolatile β meaning it will no longer escape from a surface and into the air. βNonenal would be a perfect candidate for this malodor masking technology,β Dr. Warren says. βBut to my knowledge no one is asking for a product to counteract this smell. The market is not driving a need.β Itβs possible that the topic is too sensitive for an American company, Dr. Warren says. The manufacturers of feminine hygiene spray have received complaints of sexism, so health and beauty corporations may be leery of provoking older consumers. For now the best advice for combating age-related odor is simply to take care of yourself and your home: exercise, stay healthy and hydrated, eat clean food, open windows, launder clothing and sheets. And donβt worry about it. I recently stopped by the home of the friends who had stayed at my house to return a few things theyβd forgotten. They made tea and as we talked I noticed the same funky, sweet strawberry smell. But in their homey, pillow-strewn living room, it did not bother me. Context, I thought. In that respect, Dr. Lundstrom was right.βFull Article Available Here.