old person smell; body odor associated with aging
Refers to the distinct body odor that can develop with age, often discussed in the context of personal care products.
Lately, I've started to worry about old person smell.
Soap for combating old person smell is selling well.
Compound of 加齢 (かれい, 'aging') and 臭 (しゅう, 'smell, odor'). The term became widely known in the early 2000s through marketing of deodorant products.