Most uninsured young adults — even the so-called young invincibles — believe they need health insurance, according to new analysis. But cost still remains a barrier to getting it.

The Robert Wood Johnson Foundation found that just two in 10 uninsured young adults ages 18 to 29 said they were "healthy enough" to go without health insurance. The finding is important as participation from young people will be crucial to the success of the new exchanges under the Patient Protection and Affordable Care Act in order to balance out older, sicker patients.

"Even among uninsured young people who call themselves risk-takers, most say that going without health insurance is one risk they don't want to take," said Kathy Hempstead, senior program officer at RWJF. "These results show that demand for coverage is strong, even in this challenging demographic. The challenge for the marketplaces will be to meet this demand by providing these 'young invincibles' with products they can afford. If they do, that will benefit everyone."