Every society has to make some kind of sacrifice of compromise in usage of resources. Testing everyone yearly is a massive waste of time and resources and money, and won't achieve any benefit, whereas testing old people will.

I don't care if that's "ageist". It's a biological fact that older people suffer from cognitive decline, slowed reaction times, etc.

Is it also "sexist" to claim that only women are able to get pregnant?

I propose greater enforcement of existing traffic laws (instead of just speed and DUI); and a heavier hand when it comes to revocation. This would target those who need to be retested the most regardless of age and the burden of doing so can be put on them through fees.