“The day will come when I will become sick,” Mugabe said in an interview on state-owned Radio Zimbabwe, dismissing fears about his health.
“As of now, I am fit as a fiddle.”
He poked fun at reports that he suffers from a life-threatening disease.
“I have died many times,” he said. “That’s where I have beaten Christ. Christ died once and [been] resurrected once. I have died and [been] resurrected and I don’t know how many times I will die and resurrect.”
Mugabe, in power since independence in 1980, said he will stand again in new elections that he insisted should be held this year – with or without the new constitution required under Zimbabwe’s power-sharing deal with Prime Minister Morgan Tsvangirai.
“I came from the people and the people, in their wisdom, our members of the party, will certainly select someone once I say I am now retiring, but not yet. At this age I can still go some distance, can’t I?”
Mugabe was chosen in December by his Zanu PF party to stand again as its presidential candidate.
“There is no one who can stand and win at the moment,” he said of the contenders in his party jostling to succeed him.
“We just must have elections. They just must take place with or without a new constitution. If others don’t want to have an election, then they are free not to participate,” he told state television.
“Nobody is forced to go to an election but definitely I will exercise my presidential powers in accordance with the main principal law, the constitution of our country, and announce when the election will take place.”
Mugabe’s health has been the subject of much speculation, especially since WikiLeaks last year released a 2008 diplomatic cable saying central bank chief Gideon Gono had told then-US ambassador James McGee that Mugabe had prostate cancer and had been advised by doctors he had less than five years to live.
Last year, he visited Singapore several times, with his spokesperson saying the president had gone for cataract surgery amid repeated media reports that he was suffering from cancer.
Mugabe’s health has been cited as one reason that a faction of his Zanu PF party has pushed to rush new elections.
He turned 88 on Tuesday, marking the day with staffers and his wife Grace, sharing a birthday cake in the colours of the national flag.
Vice President Joice Mujuru led staff in singing ‘Happy Birthday’ to Mugabe as he came into his office in the morning, and ministers also sang for him during a cabinet session, attended by Prime Minister Morgan Tsvangirai.
He will hold public celebrations at a stadium in the eastern border city of Mutare on Saturday, which will include a football match by major league teams and a concert featuring the country’s top musicians.