8. Omar Bongo Ondimba (73) – Gabon
El Hadj Omar Bongo Ondimba was a Gabonese politician who was President of Gabon for more than 41 years from 1967 until his death in 2009.
He was the second president of Gabon and ruled till June 2009, when he died of a heart attack. He had ruled the country for 41 years by the time of his death.