Thoughts

People retire at 65 in the UK, and then have to live on a reduced income, made worse by successive governments keeping their pensions non index linked.
Retaking a driving test over 65 would no doubt be mandatory, but it is equally unlikely to be free of charge. Not good news for people on a low fixed income.
The UK government derives vast sums of money from Road Tax, Excise duty on fuels, and income from speeding fines. Is it likely that they would fund these mandatory tests, even though they rake in vast sums of money from drivers? Not very likely one thinks.