Mugabe's recent fall at Harare Airport fuelled renewed speculation that old age is catching up with the man who has led Zimbabwe since independence in 1980. The spry Mugabe, however, succeeded in breaking his fall and apparently was not injured. His officials say he is in good health.
In addition to being in power in Zimbabwe, this year Mugabe is also chairman of the 54-nation African Union and the 15-nation Southern African Development Community.
The celebrations are leaving a sour taste in the mouth for some Zimbabweans battling to survive under economic deterioration that has led to company closures, massive unemployment and successive food shortages.
Zimbabwe's once prosperous economy took a severe knock in 2000 when Mugabe began seizing white-owned farms. Allegations of vote-rigging and violence in elections that year brought the United States and the European Union to impose travel and financial sanctions on Mugabe, his inner circle and some state institutions and firms.
"The celebrations show what has gone wrong in this country. Only those close to Mugabe feast while the rest of us starve. Look around, everyone is now a vendor," said John Ratambwa, an unemployed 23-year old Harare resident. "At 91 one has to rest. Ninety-one years is too old an age to lead a vast country like Zimbabwe," he said in downtown Harare, whose sidewalks now teem with people selling wares.