In reviewing the current delivery model, the nurse manager is aware that a demographic change that will have a significant effect on healthcare delivery systems of the future is:

The correct answer is C: the increasing percentage of the population that will be over age 65. This demographic change is significant because it will lead to an increase in the demand for healthcare services due to the higher prevalence of chronic conditions and the need for specialized care for older adults. As the population ages, healthcare systems will need to adapt by providing more geriatric-focused care, implementing age-friendly practices, and adjusting resource allocation to meet the unique needs of this demographic.

Choices A, B, and D are not directly related to the specific demographic change of an aging population. Escalations in the cost of healthcare (choice A) are influenced by various factors, not solely by the aging population. Increasing reports of violence in the workplace (choice B) and changes in staffing patterns (choice D) may impact healthcare delivery systems but are not directly tied to the demographic change of an aging population.