While we love and honor our elders, we also recognize that aging comes with more than just wisdom.

The physical changes that occur as we grow older extend far beyond appearance — and one of the most noticeable is a distinct body odor often associated with elderly individuals.

Commonly referred to as “old people smell,” this term isn’t exactly flattering, but science has confirmed that the scent is real. Most of us have encountered it before: a musty aroma with hints of oil or grease, almost as if it comes directly through the pores.

You might notice it in a relative’s home, in nursing facilities, or standing in line at the supermarket. Despite what some may think, it has very little to do with personal hygiene.

What Causes the Odor?

Researchers say the odor is linked to a compound known as 2-nonenal. As people age, hormonal shifts trigger an increase in fatty acids on the skin. At the same time, antioxidant levels decrease, leaving those fatty acids vulnerable to oxidation — a process that results in higher levels of nonenal.

This compound can cling to the skin even after bathing and tends to be most noticeable around the chest and back.

Illness and certain medications may intensify the scent as well. A 2001 study published in the Journal of Investigative Dermatology found that older adults had greater concentrations of nonenal trapped in their clothing.