List of presidents of the United States by age
The median age upon accession to the presidency is 55 years and 3 months. This is how old Lyndon B. Johnson was at the time of his inauguration. The youngest person to assume the office was Theodore Roosevelt, who became president at the age of , following William McKinley's assassination; the oldest was Donald Trump, who was old at his inauguration. The youngest person to be elected president was John F. Kennedy, at of age on election day; the oldest was Ronald Reagan, who was old at the time of his election to a second term.
Meeker Hotel
Theodore Roosevelt stayed at the Meeker Hotel in the winter of 1901. He was inspired to write a book about the area. 
The Meeker Herald of January 12, 1901 reported:
"Gates Keenesburg left Tuesday afternoon for Rifle with a swell tallyho and
fours handled by the prince of jehus Ed Wolcott, for the purpose of meeting
a select party of gentlemen who had previously made arrangements to enjoy a
few weeks’ vacation in this out-of-the-way place. It was nearly eight
o’clock last evening when the rig returned to Meeker, and among its occupants
were none less than Hon. Theodore Roosevelt, of Oyster Bay, N.Y. They were at
once taken to St. James rectory, where the Rev. H.A. Handel had an elegant
spread awaiting them. In deference to the vice-president-elect's wishes it
was pre-arranged that there would be no public demonstration, but there was a
general desire to meet and shake hands with the distinguished gentleman.
However, it was near midnight before the party proceeded to the Meeker Hotel,
where rooms were reserved for them, and but few had the pleasure of an
introduction. That the famous “rough rider” will find plenty of sport in the
next three weeks goes without saying.”
“[Theodore Roosevelt] killed his cougar near Meeker, Co in 1901. It measured 15 12/16 inches (skull measurement). President Roosevelt was given outright claim to the record for about 53 years.”.
With the assassination of President McKinley, Theodore Roosevelt, 42, became the youngest President in the Nation's history. He brought new excitement and power to the Presidency, as he vigorously led Congress and the American public toward progressive reforms and a strong foreign policy.