If you've ever associated a smell with old age, you weren't imagining it—it all has to do with the chemistry of our skin.

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Sources:
http://www.jidonline.org/article/S0022-202X(15)41198-4/fulltext - back-bb0055
http://www.jidonline.org/article/S0022-202X(15)45554-X/pdf
https://www.sciencedirect.com/science/article/pii/S0753332299800870
https://www.agingcare.com/articles/old-person-smell-174839.htm
http://www.dana.org/Cerebrum/2001/Ah,_Sweet_Skunk!_Why_We_Like_or_Dislike_What_We_Smell/
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0038110

Image Sources:
https://pixabay.com/en/baby-child-kid-girl-cute-care-1317646/
http://www.thinkstockphotos.com/image/stock-photo-portrait-of-a-senior-man/506672759/popup?sq=Old%20man/f=CPIHVX/p=6/s=DynamicRank
https://commons.wikimedia.org/wiki/File:4-Hydroxy-2-nonenal.svg
https://commons.wikimedia.org/wiki/File:Blausen_0353_Epidermis.png
https://pixabay.com/en/skin-brown-skin-skin-up-close-2016480/
https://pixabay.com/en/roses-rosebush-flowers-blooming-1198495/