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What age does 2-nonenal start? The science behind the 'aging odor'

According to a 2001 study published in the *Journal of Investigative Dermatology*, a distinct body odor compound known as 2-nonenal was detected exclusively in subjects aged 40 and older. This groundbreaking research sheds light on the biological processes behind age-related odor and definitively answers what age does 2-nonenal start.