During which president's term did the British burn the White House in 1814?

Which president was the youngest ever elected? Which president was the youngest ever to take office, at age 42? Which president lived to age 100, the longest-lived in U.S. history? Which president was the first to live in the White House? Which two presidents died on the same day, July 4, 1826? Which president was the only one elected unanimously by the Electoral College? Which president was the only one who never married? Which president married in the White House during his term?