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Why do old people's homes have a certain smell? Unpacking the science and contributing factors

According to a study published in the *Journal of Investigative Dermatology*, a naturally occurring chemical compound called 2-nonenal increases in the skin as people age, contributing significantly to why old people's homes have a certain smell. This distinctive aroma is not a sign of poor hygiene, but rather a complex mix of biological and environmental factors that combine to create a unique scent profile.