The state specific tables are for dependence. The age demographic tables were to show the huge drop off in the numbers of people who have tried drugs and those who use them starting with people born around 1950 and dropping off precipitously for those born before then. People born before them are much less likely to use drugs or even to have ever tried them. People born in the late fifties and beyond have more likely than not tried drugs and some of the older ones still use them. Note that 7.5% of those between 45 and 49 in 2002 reported using illicit drugs in the month before the 2002 survey, while less than one percent of those 65% and older reported using illicit drugs in that time period. Only 9.2% of those 65 and older had ever tried drugs while over 60% of the 45 - 49 years olds had. The statistics may not be addiction specific but I'd say it's a fairly safe bet that the 90% of seniors who had never even tried illicit drugs were not addicted to them.