http://www.unexplained-mysteries.com...hp/t17296.html
"Beginning in 1840 and continuing through 1960 before the assassination of John F. Kennedy, presidents elected in every consecutive 20-year administration had died in office.
After narrowly escaping death following an assassination attempt in 1981, Ronald Reagan -- who lived to become the oldest U.S. president -- was the first to defy that disturbing trend."
Hmm....