https://aaafoundation.org/rates-motor-vehicle-crashes-injuri...
Furthermore, if I remember correctly, at least some jurisdictions have laws on the books that old drivers can have their licenses taken away if they are not able to operate a car safely anymore. I'm not sure if any jurisdictions require old drivers to actively demonstrate their competency in an exam or such, but I have definitely seen people argue for that idea.
I'm not opposed to it either, and in fact I would not age-gate it. If train drivers or airplane pilots are required to prove their competency on a regular basis, why should we not require car drivers to do the same, maybe every 5 or 10 years?
Even today, very bad drivers are forbidden to drive the cars? Is it an attack on their freedom?
Expanding on this: I am sure more fatal accidents occur late at night than during the day. Do we bar night driving because of the risk?
Bigger cars cause more fatal accidents than smaller cars. Bar bigger cars from the road?
This is not only a risk management game – your simplified "absurd" examples are of the kind: "author wants to bar risky situations, why not bar big cars, they're risky". One has also to weight various social factors/costs. If barring bigger cars from the road would be beneficial for society, then yeah, let's do it, but I wouldn't bet on that. The vaccinations have some added costs (production, distribution) and risks (side-effects), but the question is whether the cost/risk of the longer pandemic isn't even bigger (AFAIR it is). I don't say, that OP is right that people should be forced to be vaccinated, but I don't find it absurd given that we've already sacrificed many other freedoms for the society. It's like @mayewsky writes, we already bar some drivers (because of age/health state/previous offenses against the law) from driving. It's nothing new and it's not controversial AFAIK.