Based on the clue 'at 81 he was the oldest man to sign the us constit...', what is the answer?

What is associated with: at 752 am may 20 1927 this single engine monoplane took off from roosevelt field heading east? Based on the clue 'at 76 this center from china would be a big part o...', what is the answer? Based on the clue 'at 8 letters its the longest word hint its latin', what is the answer? What is associated with: at 80 she stepped down as president of the national american woman suffrage association in 190… What is associated with: at 81 this pennsylvanian was the oldest delegate at the 1787 constitutional convention? What is associated with: at 815 am on the 6th of this month in 1945 an atomic bomb was dropped on hiroshima? Based on the clue 'at 82 hes over a foot taller than his best friend ...', what is the answer? What is associated with: at 825000 acres texas king ranch is bigger than this us state?