I was reading a post on Mumsnet yesterday. It was by a woman who had her elderly mother living with her. The mother had her own rooms. The daughter was complaining about the 'old lady' smell eminating from her rooms.
Apparently, the official name for old person smell is nonenal. It was identified by the Japanese.
The skin has antioxidant defences which naturally weaken with age. This antioxidant protection disrupts the effect of the oxidation of lipid acids on the skin’s surface. As it declines, it can no longer prevent the oxidation process, so the acids that are broken down create a chemical called 2-nonenal or old lady smell.
Not all old people will have the smell.
Apparently, persimmon soap can help to eliminate the smell. You can buy it quite cheaply on Amazon
I was not aware of this but thought it would be useful to pass on to Gransnetters.
No offence intended 
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