Which factor is NOT known to impact the onset of presbycusis?

The onset of presbycusis, which is age-related hearing loss, is primarily influenced by various known factors such as genetics, cumulative noise exposure, and age itself. Age is a significant factor as presbycusis typically begins in middle adulthood and becomes more pronounced with advancing age.

Smoking is another factor that can contribute to hearing loss. It may affect circulation and overall health, which can in turn impact auditory function. Diabetes is associated with changes in blood vessels and nerve endings, which can contribute to hearing impairment.

Excessive screen time, while potentially leading to other health concerns, is not recognized as a direct factor influencing the onset of presbycusis. This option does not have the same solid epidemiological support in relation to hearing loss as the other choices, making it the correct answer in identifying what does not impact the onset of presbycusis.