"Old people smell" is a real thing Starting at about age 40…

"Old people smell" is a real thing
Starting at about age 40, human bodies begin to subtly change the way that omega-7 unsaturated fatty acids on the skin are degraded. As these acids are exposed to oxygen in the air, the change creates a smell, called “nonenal” after the 2-nonenal molecule that is produced in the breakdown process.