Old baby boomer drivers won't be a problem
The elderly nowadays are prolific voters, but the baby boomer generation isn't part of that demographic yet. On the whole baby boomers are so apathetic about voting that I think we could pass all sorts of legislation
limiting their driving privileges and they wouldn't show up to vote against it. They don't care-that's why the status quo nowadays is so shitty. They don't vote enough to change anything.
It's a moot point anyways. Once the baby boomers get to retirement age they'll have no need to commute to their jobs on a regular basis and they'll stay home all day smoking pot like they did in the sixties. Traffic will decrease exponentially. You would think that if they were such a large voting power they'd have legalized pot by now seeing how they love it so much.