There's plenty of people who live until 100, or die young. Age is no indicator on probability of death (especially not cancer), and only a moron would infer as such.
I bet you're now going to argue them (Bush, McCain) all popping their clogs in the same year as they fall under investigation, to the same disease is also them being 'old'.
Criminal organisations bump off weak links and loose chains.
By exposing them, you're literally signing their death sentence. Why do you think Q keeps dropping hints on who to dig into?
Q would likely know as such - it was my public suggestion in response to the question on how do you conduct trials on public officials (especially when dealing with corrupt judges)?
You don't: you make them one hell of a liability by exposing their criminal ties. CIA does it (ask Frank Olsen… oh wait, you can't, he's dead), criminal organisations do it.
Exposed people either squeal, go into hiding, or get popped off.
I assure you, Barbara Bush and McCain aren't going to be the last corrupt officials to pop their clogs this year.
Cancer is transferrable, injectible, now go look up Jack Ruby, you goddamn shill.