Did Chelsea mistakenly blurt out the truth? The fact of the matter, that democrats and the media do their best to hide, is that Hillary Clinton is in rather poor health. She had a minor stroke in 2010 and a much more severe one last fall that took her out of commission for over a month (all the the media bent over backwards to avoid using the "s" word - but Doctors don't give you a month of bed rest for a bump on the head or whatever they claimed it was).
Plus Chelsea knows how the White House “ages” out those that live their during their terms in. Even Mr. Obama has aged out.