Something else many people forget when discussing the signers and other revolutionaries/founding fathers--- these were not a bunch of "old white men". Their ages in 1776: Marquis de Lafayette, 18 - James Monroe, 18 - Gilbert Stuart, 20 - Aaron Burr, 20 - Alexander Hamilton, 21 - Betsy Ross, 24 - James Madison, 25 - Thomas Jefferson, 33 - John Adams, 40 - Paul Revere, 41 - George Washington, 44 - Samuel Adams, 53 -

And I must include this tidbit for old pedes like myself (I am 61): "The oldest prominent participant in the Revolution, by a wide margin, was Benjamin Franklin, who was 70 years old on July 4, 1776. Franklin was a full two generations removed from the likes of Madison and Hamilton. But the oldest participant in the war was Samuel Whittemore, who fought in an early skirmish at the age of 80. I’ll let Wikipedia take it from here:

Whittemore was in his fields when he spotted an approaching British relief brigade under Earl Percy, sent to assist the retreat. Whittemore loaded his musket and ambushed the British from behind a nearby stone wall, killing one soldier. He then drew his dueling pistols and killed a grenadier and mortally wounded a second. By the time Whittemore had fired his third shot, a British detachment reached his position; Whittemore drew his sword and attacked. He was shot in the face, bayoneted thirteen times, and left for dead in a pool of blood. He was found alive, trying to load his musket to fight again. He was taken to Dr. Cotton Tufts of Medford, who perceived no hope for his survival. However, Whittemore lived another 18 years until dying of natural causes at the age of 98."