Medicare may be available to the following populations:

Medicare is a federal health insurance program primarily designed for certain populations, and all the specified groups fit within its coverage criteria.

Individuals who are over 65 years old are the most recognized group eligible for Medicare. This age criterion is the foundational basis for the program, ensuring that elderly citizens have access to necessary healthcare services.

People with disabilities can also qualify for Medicare. Specifically, if a person has been receiving Social Security Disability Insurance (SSDI) for at least 24 months, they become eligible for Medicare coverage. This inclusion ensures that individuals who may not reach the retirement age but require long-term healthcare support can obtain it.

Additionally, Medicare covers individuals with end-stage renal disease (ESRD). This condition signifies that a person is requiring dialysis or has received a kidney transplant due to severe kidney dysfunction. The program provides essential healthcare services to this population, recognizing the unique medical needs involved.

Since all these populations fall under the categories covered by Medicare, the most thorough and accurate answer is that Medicare may be available to all of the mentioned groups.