The study surveyed 1,000 Americans aged 50 to 68 with an annual household income between $25,000 and $100,000.

Boomers, as we all know, aren't exactly prepared for retirement, a point confirmed yet again by this study.

More than three-quarters (77 percent) of those surveyed by Bankers Life have never received any kind of specialized financial training, whether in high school, college or the workplace. Only 17 percent reported having had any formal training on retirement financial security. 

They're ignorant about mutual funds, with 42 percent saying they don't invest in them and 21 percent saying they don't know the difference between indexed funds and those that are actively managed. And 54 percent report that they have less than $100,000 in investable assets. 

That can be scary when you consider that, according to withdrawal guidelines on how to make assets last through retirement, retirees should draw no more than 4 percent of their assets per year (and that's considered aggressive) to supplement Social Security and any other income they might have during retirement. 

With Social Security averaging $15,000 per year, that means those with $100,000 should take no more than $4,000 annually from that total to increase their income — and those who have less should take less. Needless to say, that doesn't bode well for a comfortable retirement. 

Most boomers also have most of their assets tied up in their homes, but plan to age in place — meaning that they won't be able to draw on the value of their homes to help them meet retirement expenses. 

They also underestimate the amount they'll likely spend on medical expenses in retirement. Survey respondents estimated the cost of a single year in a nursing home at $46,890; the actual figure is almost twice as much, coming in at an average of $90,520.

And 63 percent have no will; 64 percent have no living will; and 65 percent have no healthcare power of attorney.