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老年人发音声学变化之确切原因尚不清楚。有认为是喉老化而出现组织结构、物理特性和生化的改变；有的认为与环构关节或周围组织的内在变化有关。这些复杂和多因素综合的病理生理改变不同程度也影响了声带振动，出现老化发音。老化音是以音调突变、声嘶、粗糙或气息音为特点。6
The exact cause of acoustic changes in the elderly is not yet clear. There are changes in organizational structure, physical properties and biochemistry that are thought to be aging of the larynx; others are thought to be related to the inherent changes in the periarticular or surrounding tissue. These complex and multifactorial pathophysiological changes in varying degrees also affect the vocal cord vibration, aging pronunciation. Aging tones are characterized by pitched, hoarse, rough or breathy tones. 6