Researchers reviewed data on 11,859 children involved in car accidents from 2003 through 2007. They also interviewed the parents of 1,302 injured children. Though grandparents were the drivers in 9.5 percent of the accidents, they accounted for only 6.6 percent of the injuries. Scientists concluded, after controlling for various factors like severity of the crash, seat belts, and the type of vehicle, that children were at risk about half as much when their grandparents were driving than when their parents were at the wheel. No one really knows why.
In conclusion, ban anyone under 65 from driving and mandate early bird specials at all NYC restaurants. Seems fair.