A new Associated Press-GfK poll finds that baby boomers believe by a ratio of 2-to-1 they won’t be able to rely on the giant health insurance plan throughout their retirement.

The boomers took a running dive into adolescence and went on to redefine work and family, but getting old is making them nervous.

Now, forty-three percent say they don’t expect to be able to depend on Medicare forever, while only 20 percent think their Medicare is secure. The rest have mixed feelings.