Sorry to come on and disagree with you Jura, but for those of us who are legally here or arrive before the end of 2020 the Withdrawal Agreement guarantees our rights for the rest of our lives, no matter what happens in the final trade agreement. Our rights to residence, health cover and pension uprating are fixed and backed by the ECHR and ECJ.
As far as driving licences are concerned, only the old paper licences could possibly still be valid. The credit card sized ones ones have to be renewed after ten years and any kind of licence has to be changed after an offence.
I am furious about Brexit, about the damage to the economy, to freedom of movement, to the fact that our grandchildren will no longer enjoy the rights that we have had and the (imo) narrow, nationalistic world view of the leavers. I simply cannot believe that anyone can seek to dismantle the trading arrangements of the last 47 years without any coherent plan for what happens next. It is an act of economic self-harm that I find completely incomprehensible.
The one small comfort I have is that with the passing of the Withdrawal Agreement we have a legally fixed security in our country of residence.