You have to be at least35 years oldto be the chairwoman of the United States — it ’s been the same since theConstitutionwas written in 1787 . And while no president has ever been that young , Theodore Rooseveltcame pretty closely .

VP Roosevelt Assumed Office

Roosevelt became the 26th president of the United States in 1901 after the blackwash of President William McKinley . Roosevelt was 42 at the time , and stepped into the presidency because he was vice president . How he get this job in the first place is a piffling bit of a story in itself .

Roosevelt became interested in political science very early in biography , and at 23 was elected to the New York State Assembly — the untried person ever elect to that bureau . After serving in various appointed government positions , becoming a cattle rancher in the Dakota Territory for a while and then a war hero in Cuba , he ran for and win the subspecies for regulator of New York in 1898 at the tender age of 40 .

In 1899 , William McKinley ’s frailty president Garret Hobart conk out of eye bankruptcy . Roosevelt was name to be McKinley ’s running married person at the1900 Republican National Convention , and secured their triumph with a whirlwind campaign enlistment of 480 stops in 23 states .

president

He serve as frailty Chief Executive for only six months before President McKinley was shot and killed while make his mode to the podium to make a speech at the Pan - American Exposition , a World ’s Fair hold in Buffalo , New York in 1901 . Roosevelt strike part only about a month before his forty-third natal day .

Kennedy Was Elected

The youngest person to become president by election wasJohn F. Kennedy , who won the1960 presidential electionand was inaugurate at age 43 .

On Nov. 22 , 1963 , when he was just barely past his first 1,000 days in office , JFK was assassinated in Dallas , Texas , also becoming the young president to die in office .

Portrait of President Theodore Roosevelt

John F. Kennedy during a news conference at the State Department on April 3, 1963