title: Aging and the respiratory system.
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging; D005767:Gastrointestinal Diseases / Q000150:complications; D006801:Humans; D008171:Lung Diseases / Q000209:etiology / Q000628:therapy*; D008875:Middle Aged; D009422:Nervous System Diseases / Q000150:complications; D009765:Obesity; D012119:Respiration; D012120:Respiration Disorders / Q000628:therapy*; D012129:Respiratory Function Tests; D012143:Respiratory Physiological Phenomena; D012137:Respiratory System / Q000503:physiopathology