Medicare is our national health plan for people aged 65 and older or under age 65 with certain disabilities. President Lyndon Johnson signed the bill establishing Medicare in 1965. The first Medicare enrollee in July 1966 was former President Harry Truman. It was simple then. Only two parts: Part A, the Hospital side and Part B, the Medical side. The confusion lies with the fact that Medicare is part of Social Security. People have a hard time distinguishing between the two. Just remember that Medicare is the “health one” and Social Security is “the money one!” Check out this great Medicare timeline below.