Final answer:
Younger drivers, those under the age of 20, generally have a higher fatality rate per million miles driven compared to older drivers.
Step-by-step explanation:
The fatality rate per million miles driven for drivers under the age of 20 is typically higher than for drivers over the age of 20. This is supported by various studies and statistics that indicate younger drivers often have higher rates of accidents and fatalities due to their inexperience and higher propensity for risk-taking behaviors.