Why are so many people around the world saying that Joe Biden is senile, and should retire?

Why are so many people around the world saying that Joe Biden is senile, and should retire?
I'm voting for him, because he has much more experience than any other of the candidates. I don't even think that Obama could have been president with out Biden showing him the ropes. Nothing against Obama, but I think that Biden was the brains behind that administration.
Why are so many people around the world saying that Joe Biden is senile, and should retire?
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