What is a key feature of Medicare?

Medicare is primarily designed to provide health insurance for individuals who are aged 65 and older. This is its central feature and purpose, allowing older adults to access necessary medical care without the prohibitive costs that can be associated with healthcare services. Medicare typically covers various health services, including hospital stays, outpatient care, preventive services, and some prescription drugs, granting seniors the ability to manage their health needs effectively as they age.

The program's focus on individuals who are 65 and older differentiates it from other health insurance programs that may cater to different age groups or demographics. While there are certain circumstances under which younger individuals with disabilities or specific health conditions can qualify for Medicare, its primary target demographic remains the elderly population, which reinforces option C as the correct answer.