A 72-year-old woman presents with bilateral progressive hearing loss for 10 years. She denies tinnitus or vertigo. Otoscopy is normal. Pure tone audiometry shows bilateral symmetrical sensorineural hearing loss that is worse at higher frequencies (8 kHz > 4 kHz > 2 kHz > 1 kHz > 500 Hz). Speech discrimination is mildly reduced. Bone conduction and air conduction thresholds are equally elevated. What is the most likely diagnosis?

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