More than half of American workers are somewhat confident or very confident that they'll be able to retire comfortably. Confidence is highest among millennials and boomers. Generation X, the middle child among the big demographic segments, is more pessimistic than its younger and older siblings.

That's just one of the conclusions reached by Transamerica Center for Retirement Studies in its 16th annual survey on American workers. One more conclusion: Only about one-third of Americans use financial advisors, so there's a significant potential market of clients out there.

Scroll below to see just how confident these demographics are or click here to view this content as a slideshow.

Slightly more than one-third of Americans (35%) use advisors. That percentage has held fairly steady over the past five years, fluctuating from a low of 32% in 2011 to a high of 37% last year. The bigger picture, of course, is the two-thirds of American who do not use advisors. The following slides highlight the three big demographics -- millennials, Gen X and boomers  -- and shows how confident they are in their ability to retire comfortably.