 Senior White House advisors for more than a year have aggressively staged, managed President Biden's scheduled movements and personal interactions as they sought to minimize signs of how age has taken a toll on the oldest president in U.S. history. Really, we're not going with dementia or Parkinson's. We're going with age. That's the only problem here. Of course, that's the official thing. The White House has limited Biden's daily itinerary and shielded him from impromptu exchanges.