The Top Ten

I believe that the universe is governed by an all-powerful deity and that the guys listed below are surely the most cruelly sublime joke he's played upon the human race over the past fifty years.

This is a list of the longest serving presidents in the world (not including royalty. i.e. queens, kings, emperors, sultans and emirs etc.

1) Cuba's Fidel Castro, since February 16, 1959 (born August 13, 1926)
2) Gabon's Omar Bongo, since November 28, 1967 (born 30 December 1935)
3) Libya's Muammar Al Qaddafi, since September 1, 1969 (born 1942)
4) Western Sahara's Mohamed Abdelaziz, since August 30, 1976 (born August 17, 1947)
5) The Maldives' Maumoon Abdul Gayoom, since November 11, 1978 (born December 29, 1937)
6) Equatorial Guinea's Teodoro Obiang Nguema Mbasogo, since August 3, 1979 (born June 5, 1942)
7) Angola's José Eduardo dos Santos, since September 10, 1979 (born August 28, 1942)
8) Zimbabwe's Robert Mugabe, since March 4, 1980 (born on February 21, 1924)
9) Egypt's Hosni Mubarak, since October 14, 1981 (born May 4, 1928)
10) Cameroon's Paul Biya, since November 6, 1982 (born February 13, 1933)

source: list of state leaders by date, wikipedia

They all could use plastic surgery, but if you have been in politics for that long the operation becomes medically impossible because you become double faced and develop thick skin that no pliers can cut through.