Hillary has clear epilepsy. We have now seen her in full myoclonic seizure.
But no one had dx’ed Reagan with Alzheimer’s until he left the presidency.
That is the difference. Many of us will slowly be getting Alzheimer’s. We will be working and driving and doing many tasks of responsibility, and some will be young enough to still be employed. And our abilities will slowly leave us. We cannot allow Alzheimers to take lives and responsibilities away until the abilities clearly are endangering function and safety.
Reagan may have forgotten tasks or names in his later presidential years, but with a staff, the early stages of Alz would have still allowed him to do some executive thinking and performing. I believe he only told the public when it was becoming more than forgetful.
Comfort yourself with that conclusion but no way is it true. They may have privately said “don’t ask” but he did not get full blown Alzheimer’s a month after leaving office.