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.
Senior Citizens. Elderly persons, usually more than sixty or sixty-five years of age. People in the United States who are more than sixty years of age are commonly referred to as senior citizens or seniors. These terms refer to people whose stage in life is generally called old age, though there is no precise way to identify the final stage of a normal life span.