List of presidents of the United States by age
The median age upon accession to the presidency is 55 years and 3 months. This is how old Lyndon B. Johnson was at the time of his inauguration. The youngest person to assume the office was Theodore Roosevelt, who became president at the age of , following William McKinley's assassination; the oldest was Donald Trump, who was old at his inauguration. The youngest person to be elected president was John F. Kennedy, at of age on election day; the oldest was Ronald Reagan, who was old at the time of his election to a second term.
Neelam Sanjiva Reddy
Neelam Sanjiva Reddy (19 May 1913 – 1 June 1996) was the sixth President of India, serving from 1977 to 1982. Beginning a long political career with the Indian National Congress Party in the Indian independence movement, he went on to hold several key offices in independent India—as the first Chief Minister of Andhra Pradesh, a two-time Speaker of the Lok Sabha and a Union Minister—before becoming the youngest-ever Indian president.