About 3% of adults ages 70 to 74 had dementia in 2019, compared with 22% of adults ages 85 to 89 and 33% of adults ages 90 and older. https://www.prb.org/resources/fact-sheet-u-s-dementia-trends/ For the good of the country, we need to face these facts. If not "aging out" of governmental positions, at least the need to pass some simple tests would weed out those who are no longer fit. For example, "apple, penny, table," are often the three words the neurologist asks the patient to remember. 5 minutes later, the patient is asked to recite them. If one cannot perform this task, that person is not fit to govern.