Joe Biden’s decision not to stand for re-election in the US begs the question: is there a right time for a leader, whether in politics or business, to retire? 

In Biden’s case, few would disagree with his call to hand over to a younger candidate given the frailties he revealed in his TV debate with Donald Trump.

The ageing process comes to us all, and if a leader’s ability to perform at their best is impeded by declining physical and mental health, then reducing hours or retiring altogether are really the only options.

But accepting one’s limitations is never easy, and even Biden spent several weeks’ protesting that he was fit for another term at the age of 81 before the evidence of the polls made the decision for him.