Biden and his advance directives or his 'living will' to his 'helpers'

 For ageing politicians like Joe Biden  who lack the relevant decision-making capacity at the time the decision is to be made, a need arises for surrogate decision-making: someone else must be entrusted to decide on their behalf.

So the whispers are no doubt correct that someone is pulling the ageing or as some assert the clearly senile Biden threadbare strings

It is conceivable that a man like  Biden who formerly possessed the roughly relevant decision-making capacity might have anticipated the loss of that capacity and left instructions for how future decisions ought to be made.

 Such instructions are called an advance directive. One type of advance directive simply designates who the surrogate decision-maker should be. 

A more substantive advance directive, often called a living will, specifies particular principles or considerations meant to guide the surrogate's decisions in various circumstances.