Medicare eligibility rules are available online at the American Association of Retired Persons website, which explains eligibility requirements on the basis of age, disability, work record, and citizenship or residency. Medicare eligibility generally requires U.S. citizenship or residency, approximately 10 years of qualifying work, and a minimum age of 65.
A calculator for determining Medicare eligibility and premiums is available at Medicare.gov. Through a series of questions, the calculator determines whether the user meets the various conditions that make him eligible for coverage. The calculator identifies the date on which the user may initially enroll in the Medicare program and provides an explanation of any factors that make him ineligible for coverage.