Abnormal or unpleasant odors may be caused by diseased or necrotic tissue in the respiratory or upper gastrointestinal tracts, including mouth and nasal cavity. Diseased teeth are a common cause in dogs and cats. In addition, certain metabolic diseases may produce distinctive breath odor, e.g. ketoacidosis, uremia.
Practically elderly is a person who needs special consideration due to advanced age. Which can happen in late 50s or in late 80s. If he or she can punch your lights out for calling them elderly, and you cannot run from them either, they possibly aren't.
Regardless of other connotations, a phrase such as the elderly couple in the second row suggests greater age than if the couple were described as older. See Usage Note at senior. elderly (ËÉldÉlÉª) (of people) adj a. quite old; past middle age b. (as collective noun; preceded by the): the elderly.