Why choose the age of 70 in particular? Why not 65 or 60? Or 75 or 80?
It may be interesting to consider how other countries operate.
Japan, for example, (a country with far more elderly people than here) has a cognitive assessment for every driver when they renew their driving licence after the age of 75. Not a driving test, but a test of memory and time perception similar to tests for risk of dementia. If anyone fails the test then they have to get a medical certificate stating that they do not have dementia before they can drive again.
Also, a few years ago, they introduced a driving test from the age of 75. Although this is not for everybody but only for those who have committed certain traffic violations in the three years prior.
So, if a person got a ticket for, say, running a red light, speeding, not stopping at a stop sign etc in the three years before and they are now over the age of 75 then they have to do a mini driving test.
If they are over 75 and did not get a ticket for anything then they do not have to take the test.
It has been reported that there are 8.35 million licence holders aged 75 or older and a total of 156,513 people (1.9%) were required to take the test in 2025. Of those, around 93% passed the test. Although they are making it more strict from next year and the estimate is that only around 80% will pass.
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Japan are also more robust when it comes to renewing driving licences anyway. Licences are renewed either every 3 or 5 years. Everybody has to have an eye test when they renew their licence. Everybody also has to attend a mandatory road safety lecture, depending on your driving record this can be up to two hours.
If you have a clean driving record for at least five years (no accidents or traffic offences) then you can renew every five years - instead of three - and you only have to sit through a 30 minute road safety lecture.