**Core Concept:**
Hearing loss can result from various causes, including damage to the inner ear, auditory nerve, or central nervous system. The correct answer highlights factors that typically do not contribute to hearing loss.

**Why the Correct Answer is Right:**
Hearing loss can be due to external causes (noise, chemicals, etc.) or internal factors (age-related, genetic, infectious, etc.). The correct answer focuses on internal factors that typically do not lead to hearing loss.

**Why Each Wrong Option is Incorrect:**
A. External auditory canal damage: This option is incorrect because external factors, such as trauma or infections, primarily affect the outer ear and do not directly cause hearing loss unless they involve the inner ear or auditory nerve.
B. Bone-conduction hearing aids: These devices amplify sound and improve hearing, rather than causing hearing loss.
C. Age-related hearing loss (presbycusis): This type of hearing loss is an age-related process, resulting from damage to the inner ear and auditory nerve, and is not specific to the options being evaluated.
D. Infectious inner ear disorders: Infections can cause hearing loss but are not specific to the options being evaluated.

**Clinical Pearl / High-Yield Fact:**
Presbycusis is a non-traumatic hearing loss related to aging processes, affecting both the inner ear and auditory neurons. It is a common cause of hearing impairment worldwide.

**Correct Answer:**
**Correct Answer: C. Age-related hearing loss (presbycusis)**

The correct answer is "presbycusis" because it is not directly related to the specific options provided (A, B, and D) and focuses on internal factors that typically do not lead to hearing loss.