A 68-year-old woman presents with insidious onset bilateral hearing loss over 2 years, worse for low frequencies. She denies tinnitus or vertigo. On examination, otoscopy is normal. Weber test shows no lateralization. Rinne test reveals air conduction better than bone conduction bilaterally. Audiometry shows a characteristic U-shaped curve with bone and air conduction thresholds tracking together. What is the most likely diagnosis?

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