Benjamin Franklin was 81 when he signed the Constitution. He was in poor health and needed help signing.
Thomas Jefferson did not sign the Constitution. He was away in France as the U.S. Minister.
Dancing was a popular social pass time, and General Washington was known as an avid dancer. Mt. Vernon’s website has a quote from General Nathanael Green of New Jersey that Washington danced with his wife for three hours without taking a break!
Some historians argue that there are six main ‘Founding Fathers’, due to their important roles during the lead up and during the Revolution. These are George Washington, Thomas Jefferson, John Adams, James Madison, Benjamin Franklin, and Alexander Hamilton. Other historians would include more, or even Founding Mothers, such as Abigail Adams or Martha Washington.