Many jobs available to young adults pay little and do not include health benefits. Those are two reasons cited to explain why 13 million young adults lacked coverage in 2003. That's 2.2 million more than those who lacked coverage in 2000, according to a study by the Commonwealth Fund. Those 19–29 years old who come from low-income families are especially likely to lack coverage.... Prescription medications are getting more difficult to afford, according to a study by the Center for Studying Health System Change. A bigger percentage of those with chronic medical problems could not purchase the prescription medications that they needed in 2003 than could do so in 2001, according to the HSC's Community Tracking Study Household Survey. The authors say that 18.3 percent of adults 18 and older with chronic medical conditions had problems buying medications in 2003. It was 16.5 percent in 2001.