US President Joe Biden, 78 this year, is the oldest president ever.
As of the first inauguration in U.S. history, the oldest president was former President Donald Trump, who was 70 years old as of 2017.
Prior to that, former President Ronald Reagan was 69 when he began his first term in 1981.
Reagan became president again at the age of 73, four years later as he succeeded in re-election, and when he retired in 1989, he was 77 years old, holding the title of'oldest US president of all time'.
Biden, born on November 20, 1942, was already the oldest president at the time of his inauguration, and at the end of his first term, he is 82 years old, becoming the first 80th president in American history.
The youngest president of all time was Theodore Roosevelt. He was 42 years old when he was assassinated by President William McKinley in September 1901 while serving as vice president.
Next was President John F. Kennedy, who took office in 1961, who was 43 years old.
President Kennedy was assassinated two years later in 1963.
President Biden, born in 1942, is also the first president of the'silent generation' of the United States.
Silent generation refers to Americans born between 1928 and 1945, and refers to those who lived in adolescence during a depressing and difficult period in the wake of the Great Economic Depression of the 1930s.
They are evaluated as having characteristics that value current stability rather than aptitude, and are also the generation representing the'silent majority' because of their tendency to conform to the system.
(Photo = Getty Image Korea)