Step 1 : Introduction to the question "10. Of the following, who was the youngest person to become US president?"
...1. James Polk 2. Ulysses Grant 3. John F. Kennedy 4. Theodore Roosevelt Kennedy, at 43, was at the the time the youngest to be elected president. Teddy Roosevelt became president at 42, when he took up the post after the assassination of McKinley - the difference being that he was not elected by the people.