An elected president takes the oath of office at approximately noon on January 20 of the year following his election to president. Vice-presidents who assume the role presidency due to the death or resignation of the President take the oath of office as soon as possible after such death or resignation. The oath must be administered by a public official , such as a notary public or magistrate who is legally qualified to administer oaths.
January 20th
The President assumes his duties upon being sworn into office. This used to occur on March 4, but in 1934, it was moved to January 20, and it is on that day when the new president officially takes office.
The 25th amendment to the Constitution allows for a procedure to allow the Vice President to assume the duties of "Acting President".
The vice president becomes President if the President dies or is removed from office . There are also procedures by which the vice-president can temporarily assume the duties of president, either voluntarily or involuntarily.
On January 20th
The constitution requires that before a President can assume their duties they have to take the oath of office. The oath is administered at the official ceremony, the inauguration. When the incoming President speaks the final words of the oath, their Presidency begins and the former President's term in office is officially over.
The vice president then becomes the president.The vice president would assume those duties.
the vice president
It is Speaker of the house I believe.
No yes no maybe yes who cares
Although the Speaker of the House would assume the presidency if both the President and Vice-President die or are rendered incapable of carrying out the duties of the office, to date this has not actually happened except in fiction.
Kennedy was the youngest elected US president.