'Old person smell' is a normal part of ageing – even if you wash lots

dailystar.co.uk:

The study says: “Human body odor consists of various kinds of odor components. “Here, we have investigated the changes in body odor associated with aging.“The body odor of subjects between the ages of 26 and 75 was analyzed by headspace gas chromatography/mass spectrometry.“2-Nonenal, an unsaturated aldehyde with an unpleasant greasy and grassy odor, was detected only in older subjects (40 y or older).“Furthermore, analysis of skin surface lipids revealed that ω7 unsaturated fatty acids and lipid peroxides also increased with aging and that there were positive correlations between the amount of 2-nonenal in body odor and the amount of ω7 unsaturated fatty acids or lipid peroxides in skin surface lipids.“2-Nonenal was generated only when ω7.