James Humes. Which President Killed a Man? Tantalizing Trivia and Fun Facts about Our Chief Executives and First Ladies. New York: MJF Books, 2003.
P 7: Who was the youngest President in the White House?
“‘Not that damned cowboy in the White House?’
These were the words of Senator Mark Hanna when he heard the news that President William McKinley had been shot in Buffalo in September of 1901. Theodore Roosevelt was a little over forty-two years and ten month when he was sworn in. In March of that year, when the political boss of New York, Tom Platt, was asked whether he was going to attend the inauguration of President McKinley for his second term, Platt said: ‘No, I’m going to see Teddy Roosevelt take the veil.’ Roosevelt had resigned the governorship of New York to assume the vice presidency.”