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What causes an old person to smell in a house?

While the "old person smell" is a widely acknowledged phenomenon, a 2012 study published in the journal *PLoS ONE* found that people can identify age simply by scent alone. This distinct aroma, which can permeate a house, has multiple scientific and environmental causes that require a compassionate and informed approach when addressing them. Understanding what causes an old person to smell in a house is the first step toward effective management and care.