A health insurance program for people age 65 or older. Certain people younger than age 65 can qualify for Medicare, including those who have been entitled to Social Security disability benefits for 24 months, those who have permanent kidney failure, and those who have been exposed to environmental health hazards. The program helps with the cost of health care, but it does not cover all medical expenses or the cost of most long-term care. Online applications can be completed at www.ssa.gov.