Who is eligible for Medicare?

Medicare eligibility primarily targets specific groups based on age and health status. The correct answer highlights that individuals who are 65 years old or older are eligible for Medicare. This is a key feature of the program, as it was designed to provide health coverage for older adults when they often face increased medical expenses.

Additionally, individuals who are under 65 but are permanently disabled also qualify for Medicare. This incorporation of people with disabilities allows Medicare to serve a broader range of the population who may need healthcare services earlier in life, ensuring that those with qualifying disabilities have access to necessary medical care.

In contrast, the other options do not encompass the full criteria for eligibility. While some individuals under 65 who are temporarily disabled may qualify for certain programs, this does not encompass the general Medicare eligibility criteria. Likewise, the assertion that only individuals with certain chronic conditions are eligible is incorrect, as Medicare covers a much larger demographic. Finally, the idea that all individuals, regardless of age, are eligible for Medicare is misleading, as age and disability status are the primary factors determining eligibility. Thus, the correct option accurately reflects the program's design and intended beneficiaries.