Actually, as a British over-55-under-70 myself I would support this. I've always thought that drivers should have to take a test every ~10 years in any case.

The main problem I see with over-70s renewing their licence currently is that they have to self-certify that they are safe to drive. Many are reaching a position in which they rely on the car more and more because walking and going on the bus is harder when your agility, cognition and eyesight diminishes. Of course, they will self-certify that they are safe, that is perfectly understandable from their perspective. It needs to be independent.