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.
2. pl. elderly (used with a pl. verb) Older people considered as a group. Often used with the: special recreational programs for the elderly. elâ²derÂ·liÂ·ness n. Usage Note: Elderly applies to the stage of life well past middle age. When used as a noun in referring to older persons in general, it is relatively neutral, denoting a group of people whose common characteristic is advanced age: policy issues of special interest to the elderly.