[Graybeard58]

The lack of ability to detect odors is called "anosmia".

My brother has it, it has developed in the last couple of years, he's 76 years old.

A blessing sometimes but I'd hate to miss out on awakening in the morning to the smell of bacon frying, among many other great smells.

[Chickensoup]

Sadly there is some research on the onset of anosmia as an early indicator of Alzheimer’s.