[jjotto]

hasn’t taken a bath for more than 13 years and is not smelling?

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

[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.