What the left is too dim to pick up on is that the issue with Biden was mental, not his age. Obviously his age played a part in it, but it was his mental incompetence that ultimately caused Pelosi and Obama to force him out and anoint Kommie-la.
Trump does not have the mental decline that Biden suffers. Is he as sharp as he was when he was 30? No, of course not. But anyone with any experience dealing with the elderly knows that Trump is just fine.
Although, at his age, he could mentally decline relatively quickly. And if Trump started to decline and got even half as bad as Biden was on day one of the Brandon administration, I would call for Trump to resign.
