[mjp]

I don’t know what causes parkinsons smell, but old people smell is thought to be caused by a chemical called 2-nonenal

[Himyar]

I am “cursed” with an excellent sense of smell. It really is no fun. It has been handy a few times. I detected an electrical fire at work long before anyone else could smell it. All in all though it is a pain. Perfume, body odor, bad breathe etc. are really a problem.