The generation that once celebrated sex, drugs and rock 'n' roll as a right of passage is carrying substance abuse into retirement, says a U.S. government survey released last week.

Illicit drug use shot up 116 percent over the past five years for Americans between the ages of 55 and 59, according to a 2007 study by the U.S. Substance Abuse and Mental Health Services Administration.

In that age group, 4.1 percent of those queried said they had used illicit drugs within the previous month, up from 1.9 percent in 2002.

Similarly, 5.7 percent of those between the ages of 50 and 54 reported using illicit drugs, up from 3.4 percent in 2002, a 68 percent increase.

"This is the baby boomer generation," said John Walters, director of the White House Office of National Drug Control Policy.

Millions of boomers who were habitual users of marijuana, cocaine, heroin, hallucinogens or other drugs as teenagers, he said, are now living with the disease of substance addiction.

Throughout much of the 1960s, use of alcohol and illicit drugs was regarded as an accepted -- if illegal -- expression of youthful rebellion, said Mr. Walters.

"Everybody looked the other way," he said, instead of spotting red flags for substance abuse.

"It was so accepted -- the sex, drugs and rock 'n' roll -- and it's caught up with a lot of us -- if we're still alive," said Candy Finnigan, 61, who works to help people kick substance abuse problems and has appeared in the A&E network's docudrama "Intervention."