Who was the Youngest signer of the Declaration and Constitution?

Edward Rutledge, age 26, was youngest signer of the Declaration; Franklin at 70 was the oldest. Johnathan Dayton, also age 26, was the youngest signer of the Constitution. Dayton, Ohio is named for him. Roger Sherman, who was heavily involved in the Declaration of Independence, was 66 and the oldest to sign the Constitution. Check the links, Google is your friend.