No, he was the second born. His brother Edward was the youngest.
NO.
I think John Kennedy
Kennedy was the youngest elected US president.
John F Kennedy
John F. Kennedy at 46, followed by James Garfield at 49. They were both assassinated in office. The youngest president to die a natural death was James K. Polk who died of cholera at 53.
John Adams was the eldest of three sons.
Oldest was Ronald Reagan, who was elected at age 69. Youngest was John F. Kennedy, elected at age 43. However, Theodore Roosevelt assumed office at 42 years old (he was not elected).
John F. Kennedy and Jacqueline Kennedy had four children in order from oldest to youngest: Caroline Kennedy, John F. Kennedy Jr., Patrick Bouvier Kennedy (who died at 2 days old), and Arabella Kennedy (who was a stillborn).
Edward M. "Ted" Kennedy
The youngest person to serve as President of the United States was Theodore Roosevelt, who assumed office at the age of 42, following the assasination of William McKinley. John F. Kennedy was the youngest when elected president and youngest who died.
John F. Kennedy (46)
John F. Kennedy