Final answer:
Determining the safest age of drivers involves statistical analysis of accident rates by age group. Without specific data, it is not possible to accurately identify the safest age group. Proper analysis would require data on driver deaths per 100,000 people by age group, factors like driver error, and vehicle safety ratings.
Step-by-step explanation:
Statistically, finding the safest age of drivers in terms of driver casualties involves analyzing various data points to determine which age groups have the lowest rates of fatal accidents. This type of question typically involves statistical analysis of the age groups of drivers and the corresponding accident rates to deduce the safety of different age groups. However, comprehensive data that directly answers this question has not been provided in the reference information available. Without specific data points, it is not possible to give an accurate answer on the safest age of drivers based on driver casualties. To answer this question accurately, one would need to analyze data on driver deaths per 100,000 people for the selected age groups, taking into account factors such as driver error, types of vehicles driven (as suggested by safety picks from the Insurance Institute for Highway Safety), and the demographics of the driving population.