Question: Who is the youngest person ever elected president?
Disambiguated questions and answers: question: Who is the youngest person ever elected president from United States?
Who is the youngest person ever elected president from India?
Who is the youngest person ever elected president from China?
answer: Theodore Roosevelt Jr.
Theodore Roosevelt
Neelam Sanjiva Reddy Language
Xi Jinping
Natural Questions answer: John F. Kennedy (from the Wikipedia article "List of presidents of the United States by age")