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The correct answer encompasses a broader range of individuals than just those aged 65 and older. Medicare is a federal health insurance program primarily designed for individuals who are 65 years of age and older. Additionally, it extends coverage to younger individuals who qualify due to certain disabilities. Specifically, individuals who have been receiving Social Security Disability Insurance (SSDI) for at least 24 months, as well as those with specific conditions such as End-Stage Renal Disease (ESRD) or Amyotrophic Lateral Sclerosis (ALS), are also eligible for Medicare before reaching age 65. This dual eligibility reflects the program's purpose of providing essential healthcare coverage for both older adults and those with significant health challenges, allowing for a comprehensive healthcare solution regardless of age, as long as the necessary criteria are met.