Wow, only 60? I thought he was older than that!
TR is still the youngest person ever to be President—he was 42 when McKinley was assassinated. JFK was 43 when he was elected President. TR began his political career in the NY legislature when he was about 23...so he had been in the public eye for many years. I think some people were expecting him to run again for the Presidency in 1920.