Age has nothing to do with it. DH had an assessment with a driving instructor last week. I am due one soon, to make sure that we are both fully capable of driving safely, including long journeys.
The instructor was amazed, when, at the end of the assesment, she asked his age, 78 to be precise. She had assumed from seeing him and his alertness when driving that he was considerably younger. In recent years he has qualified as a member of the Institute for Advanced Drivers.
How does the killing pedestrians figure for older drivers compare with that for younger people? I suspect the figures will turn out to be in older drivers favour.
There are bad drivers, good drivers, and dangerous drivers in every age group. If we really wanted to reduce deaths, it is the under 25 year olds, or even under 30 year olds who should be banned from driving, or possible keep new drivers off the road. Most accidents happen in the first 5 years of a drivers driving career.