<human>: What are some of the most interesting facts about the US presidency?
<bot>: 
1. The first US president to be born after the ratification of the 20th Amendment was John F. Kennedy in 1917.
2. The youngest person ever elected as President of the United States was John Quincy Adams at the age of 42 years and 252 days in 1824.
3. Grover Cleveland, who served two non-consecutive terms as president, is the only person to serve more than one term without being elected by the Electoral College.
4. William McKinley, the 25th president of the United States, was assassinated in 1901.
5. The current US president is Donald Trump.