Gotta agree that, in general, age discrimination is an example of antisocial behavior that should be excised from human culture...or at least in our current state drastically mitigated. That said, it does seem to make sense to have people start retaking the In Car evaluation on some kind of regular interval when renewing their driver's license.
Furthermore; Age Discrimination is just one example of how we as a whole are vastly over tolerant of antisocial values and behaviors. A truly hopeful step would be to see organizations like AAPIP, AARP, ADL, AIM, BLM, GLAAD, ILGA, LULAC, NAACP, NARF, and dozens of others (possibly excepting KKK et. al.) acknowledging in their charters and mission statements that they are seeking redress of one symptom of the mental illness of Antisocial Personality Disorders expressed at the cultural level. It would be truly hopeful to see these efforts unified under a single coherent banner.