Millennial drivers between 19 and 24 are a serious hazard to other motorists. According to the AAA Foundation for Traffic Safety, over 88 percent of millennials engaged in at least one dangerous driving behavior within a 30-day period. Older drivers and teens between 16 and 18 are also guilty of engaging in the risky driving behavior, though not to the same degree. Overall, young millennials are the worst offenders when it comes to engaging in risky behavior behind the wheel, especially regarding distracted driving where cell phones are involved.