Science, Tech, Math › Science The Truth Behind 'Old People Smell' The Science of Body Odor and Aging Share Flipboard Email Print Maskot / Getty Images Science Chemistry Chemistry In Everyday Life Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated November 06, 2019 "Old people smell" is a real phenomenon. The chemical composition of odor-producing molecules changes as we age and there are other factors that affect how the elderly smell. Here's a look at some biological and behavioral reasons for changes in body odor as we get older—and tips for minimizing the smell (should you wish to). Key Takeaways Body odor naturally changes as people age but there are other factors that contribute to "old people smell."Research indicates people generally don't perceive an elderly person's natural body odor to be unpleasant.Other factors can contribute to unpleasant body odor, including medication use, underlying illness, diet, and perfume use.Body odor can be minimized by increased bathing frequency and with the use of a deodorizing antiperspirant. Body Odor Changes as We Age There are several reasons why the retirement home smells different from the high school gym: Body chemistry changes over time. The characteristic scent associated with the elderly is the same, regardless of a person's ethnicity or culture. Scientists have figured out what's happening: As people age, fatty acid production in the skin increases while antioxidant production decreases. Polyunsaturated fatty acids are oxidized, sometimes increasing the amount of a chemical called 2-nonenal. Nonenal is an unsaturated aldehyde known for its grassy, greasy scent. Some researchers did not detect 2-nonenal; however, they did find higher levels of the funky organics nonanal, dimethylsulfone, and benzothiazole in the body odor of older subjects.Illness and medications change a person's odor. Older people are more likely to take a prescription than younger people. Both the underlying medical condition and the drug can affect body odor. For example, taking garlic as a supplement is known to affect odor. Body odor is a side effect of bupropion hydrochloride (Wellbutrin); leuprolide acetate (Lupron), used to limit hormone production; topiramate (Topamax), used to treat epilepsy and seizures; and omega-3-acid ethyl ester (Lovaza), used to reduce blood fat levels. Several drugs increase perspiration rate, including nonsteroidal anti-inflammatory drugs (NSAIDS), antidepressants, and codeine sulfate. Medical conditions that affect body odor include diabetes, hyperthyroidism, liver disease, kidney disease, menopause, and schizophrenia.Older people may bathe and change their clothing less often. An elderly person may need help bathing, fear falling on a slick bathroom floor, or may experience pain getting into and out of a tub.The sense of smell, like other senses, declines with age. As a result, an older person may not self-identify an unpleasant smell or might apply excessive amounts of cologne or perfume.Dental hygiene significantly affects a person's odor. As we age, the mouth produces less saliva, reducing the best natural defense against bad breath. Periodontal (gum) disease is more common in older people, also contributing to halitosis (bad breath). Dentures and bridges can retain bacteria and fungi, leading to infections and a musty smell.Aging affects our ability to sense dehydration. As the pituitary gland sends weaker signals for thirst, older people tend to drink less water. Dehydration leads to stronger-smelling perspiration and urine and can cause the skin to develop an odor from increased shedding of dry cells.Older people tend to have older belongings, which means their possessions have had time to develop odors. If you're surrounded by old-smelling objects, you carry some of their aromas. Why Body Chemistry Changes There may be an evolutionary reason that odor to change as a person ages. According to Johan Lundström, a sensory neuroscientist at the Monell Chemical Senses Center, humans use scent to find mates, identify kin, and avoid sick people. Lundström and his team conducted a study that found people were able to identify the age of a person based solely on body odor. The experiment also found odors associated with old age (ages 75 to 95) were deemed less unpleasant than those from middle-age and young perspiration donors. The odor of old men was deemed "best." The odor of older women ("old lady smell") was judged to be less pleasant than that of younger women. A logical conclusion of this study would be that the scent of old men acts as a sort of nonverbal advertising for a mate proven to have genes with high survival potential. The scent of an older woman might mark her as past childbearing age. However, test subjects reacted neutrally to body odor from all age groups, so natural biochemical changes do not, of themselves, produce an unpleasant aroma. Getting Rid of Old Person Smell Keep in mind, the natural body odor of an older person is not considered objectionable! If an elderly person smells bad, it's probably due to one of the other contributing factors. Increased attention to personal hygiene and upping water intake should be enough to address unpleasant odor in a healthy individual. However, if a person's smell is truly bad, there's likely an underlying medical cause. A trip to the doctor and dentist may be in order, along with a review of medications that may affect body odor. There are actually products marketed specifically to address "old people smell." In Japan, the odor even has its own name: Kareishu. The cosmetic firm Shiseido Group has a perfume line intended to neutralize nonenal. Mirai Clinical offers soap and body wash containing persimmon extract, which contains tannins that naturally deodorize nonenal. Another way to combat nonenal and other odiferous aldehydes is to stop fatty acid oxidation by using a lotion that moisturizes the skin and replenishes antioxidants. Sources Gallagher, M.; Wysocki, C.J.; Leyden, J.J.; Spielman, A.I.; Sun, X.; Preti, G. (October 2008). "Analyses of volatile organic compounds from human skin". British Journal of Dermatology. 159 (4): 780–791.Haze, S.; Gozu, Y.; Nakamura, S.; Kohno, Y.; Sawano, K.; Ohta, H.; Yamazaki, K. (2001). "2-Nonenal Newly Found in Human Body Odor Tends to Increase with Aging". Journal of Investigative Dermatology. 116 (4): 520–4. Mitro, Susanna; Gordon, Amy R.; Olsson, Mats J.; Lundström, Johan N. (30 May 2012). "The Smell of Age: Perception and Discrimination of Body Odors of Different Ages". PLOS ONE. 7.