The oldest president in the world was Somalia's first president Aden Abdullahi Cadi, who was born in 1908 and died in the year 2007. His was known as the oldest living president in the world until his death in 2007.
George Washington was the first person elected to be president of the United States so I guess you could say he was the oldest in that sense but the oldest (as in his age) president was Ronald Reagan who was elected president at the age of 69.
The oldest man to be elected as U.S. President was Ronald Reagan who was elected at the age of 69. He turned 70 three months later. If John McCain is elected President then he will be the oldest at 73.
No George Washington was not the oldest president. Ronald Reagan was the oldest elected president at the age of 69 when he was elected to his first term. He ended his presidency a few months before his 78th. George Washington was 57 when he was elected.