Who are these 65-year-olds answering "no"?
Expatriate american citizens who never worked enough in the US to be eligible for Social Security/Medicare, and have had to return to the Bad Place in their dotage to die in ignominy and misery.
More likely, they're just people who either misunderstood the question or deliberatly misled the pollster. Inquiry is not without its flaws.
Medicare is not without it's flaws either. Some people aren't eligible (at least not for free).
Didn't Obama say everyone under 25 would be covered if their parent's had insurance? Why is the decline in the uninsured so small?
19.7% of parents don't have health insurance? Plus I'm sure a fair about of 18-25 has no idea they have their parents health insurance.