Adults under age 65 were twice as likely than senior citizens to avoid filling their prescriptions or skipping the doctor's recommended dose in order to save money, according to a national survey released today by the U.S. Centers for Disease Control and Prevention. The survey found the most popular cost-cutting strategy — employed by one out of every five patients at any age — was to ask doctors to prescribe a cheaper drug, according to responses from 33,000 people who participated in the CDC's National Health Interview Survey in 2011. Out-of-pocket drug costs topped $45 billion that year, according to the CDC.