Zimbabwean President Robert Mugabe, the world’s oldest national ruler, turns 93 on Tuesday, defiantly vowing to remain in power despite growing signs of frailty and failing health.

He will celebrate with his staff in a private ceremony in Harare while supporters use state media to send their annual gushing messages of goodwill and congratulations.

The main celebrations will be held Saturday at Matobo National Park outside Bulawayo, Zimbabwe’s second-largest city, and are expected to attract thousands of officials and ZANU-PF party faithful.

Large game animals are often slaughtered for the occasion. In previous years Mugabe has reportedly been offered elephants, buffalo and impala for the feast.

Mugabe has ruled out any prospect of retiring soon, saying that ZANU-PF officials believe there is no “acceptable” alternative.

“The call to step down must come from my party… In such circumstances I will step down,” the state-owned Sunday Mail newspaper quoted Mugabe as saying in an interview aired late Monday.

“They want me to stand for elections… If I feel that I can’t do it any more, I will say so to my party so that they relieve me. But for now, I think I can’t say so,” he said.

“The majority of the people feel that there is no replacement, a successor who to them is acceptable,” Mugabe added.

The veteran leader came to power when Zimbabwe won independence in 1980 and his rule has been criticised for ruthless repression of dissent, election rigging, and for causing the country’s economic collapse.