The fact is that elected officials often stay in office as long as they can, and get really old while doing it, and we need to address this. They don't officially have tenure but it often works that way. Dementia is common today, so we need to have cognitive testing. Airline pilots are evaluated every 6 months for fitness, and for any critical professional role, it isn't too much to ask to have at least a yearly evaluation when many of the men and women who do it are elderly. But they are unlikely to pass such a law, as it would inconvenience most of THEM.