Generally your drinking drivers are aged 24 to 40. I haven't looked at the 50,000 cases that Statistics Canada broke out by age, but according to the research they're generally between 24 and 40. There is a push for zero BAC tolerance for young drivers because, due to their age and inexperience, they are a greater risk for crashing, even at low alcohol levels.
On February 7th, 2008. See this statement in context.