Former President George H W Bush (bottom) celebrates his 85th birthday by jumping with the Army's Golden Knight parachute team in Kennebunkport, June 12, 2009. REUTERS

Life after the White House

President George W Bush walks the South Lawn of the White House moments before departing the White House for the final time, January 20, 2009. REUTERS

Former President Bill Clinton and his wife Senator Hillary Rodham Clinton at the unveiling ceremony of hi presidential portrait in the East Room of the White House, June 14, 2004. REUTERS

Then President Bill Clinton poses with former Presidents George Bush, Gerald Ford and Jimmy Carter and first ladies, Barbara Bush, Lady Bird Johnson, Hillary Rodham Clinton, Betty Ford and Rosalynn Carter in the State Dining Room of the White House, November 9, 2000. Clinton and the former presidents celebrated the 200th anniversary of the White House. REUTERS

Then President George W Bush meets with former President George H W Bush, President-elect Barack Obama, former President Bill Clinton and former President Jimmy Carter in the Oval Office of the White House, January 7, 2009. REUTERS

Then President Bill Clinton steps from Air Force One with former Presidents Gerald Ford, Jimmy Carter and George Bush on their way to attend the funeral of Jordan's King Hussein, February 8, 1999. REUTERS

Former President George H W Bush leans out of a military helicopter as he departs the USS Fort McHenry for a tour of the tsunami affected areas in Aceh Province, Indonesia, February 20, 2005. REUTERS

Former President Bill Clinton and daughter Chelsea share a moment during the dedication ceremony for the William J Clinton Presidential Center, in Little Rock, Arkansas, November 18, 2004. REUTERS

Former British Prime Minister Margaret Thatcher shakes hands with former President Ronald Reagan as she participates in a birthday salute celebrating Reagan's 83rd birthday in Washington, February 3, 2000. REUTERS

Former President Jimmy Carter and Cuba's then President Fidel Castro listen to the Cuban national anthem prior to a baseball game in Havana, May 14, 2002. REUTERS

Former presidents and their wives at the funeral for former President Richard Nixon at his presidential library in Yorba Linda, California, April 27, 1994. From L to R are Bill and Hillary Clinton, George and Barbara Bush, Ronald and Nancy Reagan, Jimmy and Rosalynn Carter and Gerald and Betty Ford. REUTERS

Former Presidents Jimmy Carter and Gerald Ford point in different directions while calling on reporters wanting to ask questions at a press conference in Panama City, May 5, 1989. Ford and Carter were in Panama as co-chairmen of a international delegation to observe Panamanian presidential elections. REUTERS

President Barack Obama speaks with former President Bill Clinton as they leave the stage at the Clinton Global Initiative in New York, September 22, 2009. REUTERS

President Bill Clinton talks with former Presidents George Bush and Gerald Ford before the start of a round of golf in Indian Wells, February 15, 1995. REUTERS

Former President Gerald Ford, President Clinton and golfer Jack Nicklaus (L) study the Nicklaus-designed Country Club of the Rockies golf course near Vail, Colorado, August 14, 1993. REUTERS

President Richard M Nixon flashes the V-for-victory sign as he boards his Marine One helicopter for the last time on the South Lawn of the White House, August 9, 1974. REUTERS

Former Soviet leader Michail Gorbachev and his wife Raisa with former President Ronald Reagan and his wife Nancy, at the Reagan ranch in the Santa Ynez mountains near Santa Barbara, May 3, 1992. REUTERS

Former President Ronald Reagan (second from left) is joined by President George Bush (L) and former Presidents (L-R) Jimmy Carter, Gerald Ford and Richard Nixon at the opening ceremony of the Ronald Reagan Presidential Library in Simi Valley, November 4, 1991. REUTERS

Former US President Gerald Ford arrives for a private visit with former West German Chancellor Helmut Schmidt in Hamburg, August 29, 1985. REUTERS

Former President Ronald Reagan and wife Nancy pose for photographers with actress Eva Gabor and Merv Griffin at the fourth annual Nancy Reagan Tennis Tournament, October 10, 1992. REUTERS

President Richard Nixon gives his farewell speech to members of his cabinet and staff in the East Room of the White House following his resignation, August 9, 1974. REUTERS

Former President Jimmy Carter stands in front of the controversial Israeli barrier during a visit to the West Bank village of Bilin near Ramallah, August 27, 2009. REUTERS