What is the primary age demographic covered by Medicare?

The primary age demographic covered by Medicare is adults aged 65 years and older. Medicare was established to provide health insurance for this specific age group, as individuals tend to have increased healthcare needs as they age.

While some other groups may also be eligible for Medicare, such as individuals with certain disabilities or specific medical conditions regardless of age, the overarching aim and the majority of recipients fall within the 65 and older category. This makes option B the correct choice, as it aligns directly with the primary intent of the Medicare program, which focuses on supporting older adults in accessing necessary healthcare services.