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old man smell
Old man smell, or old person smell, is a characteristic odour secreted by elderly humans.〔http://healthland.time.com/2012/05/31/old-person-smell-really-exists-scientists-say/〕 Much like many animal species, human odor undergoes distinct stages based on chemical changes initiated through the ageing process. Research suggests that this enables humans to determine the suitability of potential partners based on age, in addition to other factors.〔http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0038110〕
In 2012 the Monell Chemical Senses Center published a press release claiming that the human ability to identify information such as age, illness, and genetic suitability from odor is responsible for the distinctive "old man smell". Sensory neuroscientist Johan Lundström stated, "Elderly people have a discernible underarm odor that younger people consider to be fairly neutral and not very unpleasant."〔http://www.eurekalert.org/pub_releases/2012-05/mcsc-tss052412.php〕
There is some research which suggests that Old-Person Smell may be the result of 2-Nonenal, an unsaturated aldehyde which is associated with human body odor alterations during aging,〔2-Nonenal〕 however, there are many other theories.〔http://thechart.blogs.cnn.com/2012/05/30/scientists-confirm-existence-of-old-person-smell/comment-page-2/〕
Old man smell is known as ''kareishu'' in Japan, where it is of particular concern due to the high value placed on personal hygiene.〔http://inventorspot.com/articles/japans_aging_population_deals_with_old_man_smell_16746〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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