How Old Is Too Old For President?

 
The question nobody in American politics seem comfortable tackling is why are all the top politicians so old?
Sure age brings experience but at what point should a politician, or someone close to them whisper in their ear, that it's time to clear the field for the next generation and this became obvious when the 81 year old Senator Mitch McConnell, suffered a senior moment when asked a question and stood silent, staring into space for 30 seconds before being rescued by an aide who ushered him away.  
It was the second time in little more than a month that he had frozen while speaking to journalists but with 80 year old Biden running for a second term which would see him hit 86 at the end, it is clear why his opposition are trying to avoid making any capital out of it.
Biden is already America’s oldest ever President and showing signs that age is catching up with him and a recent opinion poll found that more than three in four Americans think he would be too old to be effective while Republican Donald Trump, 77, is the second oldest ever President and current front-runner for the party nomination in 2024 has the same, although less obvious so far, mental challenges.
The average age of the Senate is 64 and one of the oldest memberships of any parliamentary body in the world and you would assume if there was a few hot-shots waiting in the wings of either side they would have emerged but nobody seems to be rising to the challenge.
Republican candidates Nikki Haley, 51 called the Senate the most privileged nursing home in the country and it's members should know when to leave and with a rematch between Biden and Trump appearing a likely scenario next year, her view is supported by 60% of Americans who told a Reuters/Ipsos poll that they were very or somewhat concerned that the members of Congress are too old to represent the American people.
Far be it from me to know at what age a politician should be asked to retire but it seems that only Ronald Reagan was willing to discuss his opponent's age when the 73 year old Reagan, when asked if he was too old to govern, replied: 'I will not make age an issue of this campaign. I am not going to exploit, for political purposes, my opponent's youth and inexperience'.