Firstly, in 2016, I thought the gleeful commentary - and fake expression of concern - by some conservatives about Secretary Clinton's health - on one occasion, if memory serves, she stumbled and fell, - struck me as appalling, along with the unspoken (but assumed) argument that she was, as a consequence, unfit to hold public office.
People do stumble, and trip, and lose their footing, and it has no further significance than an accident, or incident, in time. Yes, it can point to the presence of underlying conditions, and it can also point to stiffening knees.
However, it doesn't really bother.
One of the best presidents of the twentieth century, FDR (the second individual to bear the Roosevelt name to hold the office of the president) was wheelchair bound (not that much of his electorate were aware of that at the time), a legacy of his having contracted polio as a young man.
Personally, I'm far more concerned with Mr Trump's mental - and intellectual capacity, - which I think inadequate, or insufficient, for the distinguished office he holds, and I am even more concerned about the man's character, that gaping black hole - a black hole of cosmic dimensions - where an ethical core that informs how he chooses to live his life, and takes the decisions relating to public policy that follows on from that - should reside.