|The new Queen meets with
President Harry Truman
Actually, if you check out Wikipedia's list of longest reigning monarchs, she doesn't even crack the top fifty, and that's just the list of verifiable ones. Sobhuza II of Swaziland served 82 years. The Egyptian pharaoh Pepi II allegedly served 94 years. Now, obviously it helps to have taken the throne as a child, and Elizabeth was already 25 when she became queen. That'll make it tough to crack the top tier without resorting to cryogenics.