As a general rule, people experience mental and physical decline as they age. Therefore, it could make it dangerous for older people to driver on highways in Missouri and throughout the country. In 2017, drivers over the age of 65 accounted for 14% of all fatal accidents. In that same year, they accounted for 19% of the overall driving population. According to research published on TheSeniorList.com, Florida, California and New York were among the 10 states with the most fatal accidents involving senior drivers.