The average age is 55 years & 1 month. The median age is 54 years & 6 months.
James A. Garfield is the only president to inaugurated in office.
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1789
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January.
March.
No
January
The US president is inaugurated in January. That is, whoever is elected in November 2008 will be inaugurated January 2009.
The US President and Vice-President are both inaugurated on 20 January every 4 years.
Reagan was inaugurated on January 20, on both occasions. Roosevelt was first inaugurated on March 4, but the Constitution was changed and his last three inaugurations were on January 20.
Only Lincoln - inaugurated a month before the war started, and re-inaugurated a month before it (effectively) ended. If you include the small actions in North Carolina, then you have to count Andrew Johnson as a wartime president.
(March 4, 1897 to September 14, 1901)
On every full moon, senators have to be relocated, and new senators have to be voted in. So, generally, about every month we have new senators.
January
The US President is inaugurated on 20 January every 4 years.