GDL = Graduated Driving Licence. (e.g. after passing Driving Test, progress up to full licence is based on experience.)
See link for one point of view (obviously driven by very tragic circumstances), but the item includes some thoughts on how effective GDLs might be.
Let's hear a few AB views.
https://www.bbc.co.uk/news/newsbeat-45627115
[One could also argue for some of the recommended restrictions to also begin to phase in with very elderly drivers, e.g. maximum speed, night driving, etc., but that's a topic for another thread]