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hearing loss most hearing loss in older adults is caused by presbycusis, an age-related degeneration of the inner ear that results in lowered sensitivity to high frequencies and a loss in the ability to discriminate among speech sounds (so people seem to mumble). presbycusis generally affects both ears
equally. other causes of permanent hearing damage include long-term exposure to loud noises , such as power tools, heavy machinery, or loud music; brief, loud noises, such as gunfire or explosions; injuries to the ears, head, or neck; and side effects of chronic illnesses, such as diabetes, heart disease...
https://www.berkeleywellness.com/self-care/preventive-care/article/sound-advice-dont-ignore-hearing-loss
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