Final answer:
The minimum standard for hearing evaluation via audiometry is the measurement of the hearing threshold. Normal hearing registers as 0 dB at all frequencies. Presbycusis is the most common form of age-related hearing loss.
Step-by-step explanation:
The minimum standard for hearing evaluation via audiometry is the measurement of the hearing threshold, which is measured in decibels (dB) relative to the normal threshold. Normal hearing registers as 0 dB at all frequencies. The audiogram, a graphical representation of hearing tests, displays the hearing threshold in intensity level versus frequency. The most common form of hearing loss, called presbycusis, is associated with age and is more severe at higher frequencies.