Final answer:
Medicare is a federally funded healthcare program in the United States, offering insurance primarily to people over sixty-five years old.
Step-by-step explanation:
Medicare is a federally funded healthcare program in the United States. It offers insurance primarily to people over sixty-five years old. Medicare provides health services to people who meet other standards for disability as well. Blue Cross Blue Shield, Aetna, and Cigna are not federally funded healthcare programs in the United States, but rather private health insurance providers.