Millennials reported faring better with their financial resolutions than older generations, with 51 percent saying they were succeeding, compared with 40 percent of Generation X respondents and 47 percent of boomers.
Read MoreAmericans need a financial wake–up call
"People have an impression of millennials flying by the seat of their pants a lot," Bailey said. But "they saw first hand that their parents lived through the financial crisis. They are coming up with financial plans more than some older generations."
Millennials need to have that resolve: They are in the center of the student loan crisis, and the average student graduating with loans has to pay back $33,000, according to Edvisors, an education marketing company.
Read MoreStudent loan debt dragging on young households
Not only that, researchers from Northwestern University and McGill University examined data from the National Longitudinal Study of Adolescent Health and found that young adults with high levels of debt were more likely to report poor physical and mental health, and more likely to have high diastolic blood pressure.