Drug use doesn't stop with age:

The baby boomers, the generation born between 1946 and 1964, make up 29 percent of the U.S. population today. By 2030 this “pig in the python” of the nation’s age-distribution profile will swell the number of people aged 65 and older to 71 million. The baby boomers, of course, became well known in the 1960s for their significantly higher use of illicit drugs than that of preceding generations. At one time, investigators were convinced that as people aged, they would “grow out of” the use of recreational drugs. There is little evidence that any such thing has taken place today.

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