Medicare 101 Who is EligiblePeople age 65 years or older who are US Citizens, or permanent US residents living in the US for the past five years. Email Me People Under 65 with disabilities, after 24 months of receiving Social Security Disability Income (SSDI). People under age 65 with End Stage Renal Disease (ESRD) (permanent kidney failure requiring dialysis or kidney transplant). People under age 65 with Amyotrophic Lateral Sclerosis (ALS) are often referred to as Lou Gehrig’s Disease (LGD). Medicare BasicsClick the images below to learn more about each type. Click to learn about Part A Click to learn about Part B Click to learn about Part C Click to learn about Part D Click to learn about Medigap