Final answer:
The safest age group of drivers in terms of driver casualties is likely a middle age group such as between 40 and 50 years or 50 to 60 years, due to a combination of driving experience and maintained health and reflexes.
Step-by-step explanation:
To determine which age group of drivers are the safest age in terms of driver casualties, we look at the recent annual numbers of driver deaths per 100,000 people for selected age groups. The age groups provided include more than 60 years, between 50 and 60 years, between 40 and 50 years, between 30 and 40 years, between 20 and 30 years, and between 10 and 20 years. The safest age group would be the one with the lowest rate of driver deaths per 100,000 people.
Statistically, older drivers tend to be more cautious, leading to lower accident rates. Younger drivers, especially teens, have higher accident rates due to inexperience and riskier driving behaviors. Middle-aged drivers typically have the benefit of experience without the possible impairments associated with very advanced age.
Even though the exact statistics are not provided in this scenario, if we were to analyze real-world data, we would likely find that the safest age group of drivers in terms of casualties is not the youngest or the oldest, but a middle age group such as between 40 and 50 years old or 50 to 60 years old, as they have experience and generally good health and reflexes.