Incumbent President JonathanGoodluck Jonathan acknowledges defeat , says he delivered on promise of fair elections . Muhammadu Buhari 's party says Goodluck Jonathan called to concede even before final results are announced . Buhari is a 72-year-old retired major general who ruled in Nigeria in the 1980s .
Incumbent President Goodluck Jonathan acknowledges defeat , says he delivered on promise of fair elections . Muhammadu Buhari 's party says Jonathan called to concede even before final results are announced . Buhari is a 72-year-old retired major general who ruled in Nigeria in the 1980s .