1. Ears:
      1. Changes in cochlea-decrease in average pitch of sound.
      2. Hearing loss-greater in left ear than right; greater in higher frequencies than in lower.
      3. Tympanic membrane-atrophied, thickened-hearing loss.
      4. Presbycusis-progressive loss of hearing in old age.
    2. Mouth:
      1. Dental caries.
      2. Poor-fitting dentures.
      3. Cancer of the mouth-increased risk.
      4. Decrease in taste buds-inability to taste sweet/salty foods.
      5. Olfactory bulb atrophies decreased ability to smell.