I was not to see the whole article because it is behind a paywall, but one thing that might affect the driving habits of the under 25 cohort is that people in general are waiting later to have children.<p>Having children dramatically changes the calculus involved with driving a car. When I was single I really did not have to shop much, it was easy for me to walk or bike to school or work even in bad weather and I could choose a not so good place to live that was cheap and close to work cause I really did not spend too much time at home except for crashing at night.<p>With children now, I have to buy a lot more supplies. To save money I often buy stuff in bulk. Also, I am more concerned about neighborhood safety and good schools. Now a place that meets my criteria at a price I can afford is likely to not be within walking or biking distance from work. Also, when I want to go somewhere in inclement weather, I find it more preferable for me to put my children in my dry climate controlled car, than to have to worry about if they are getting wet, cold, or hot.<p>My point is not to talk about driving being good or bad but to point out that having children can be a huge confounding factor when looking driving trends and drawing conclusions about these trends without taking into account the larger demographic trends surrounding when people are having children is likes to be misleading.