Thousands of party loyalists, foreign representatives and members of the public watched as Mugabe released 92 balloons in the air, with songs and ululations ringing out around him.
Several cakes were on display at the public festivities Saturday, one in the shape of Africa, another a whopping 92-kilogram replica of the party venue: the Great Zimbabwe ruins, a UNESCO world heritage site built in the 13th Century as the headquarters of the Munhumutapa empire.
Mugabe, who turned 92 last Sunday, has ruled for 36 years during an era marked by vote-rigging, mass emigration, accusations of human rights abuses and economic decline.
On his actual birthday, state media poured praise on his leadership since independence from Britain.
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In its 16-page special supplement, the Sunday Mail said on its front cover: "Thank You Bob, We now have a voice, since 1980".
"Factionalism, factionalism and, I repeat, factionalism has no place at all in our party," Mugabe told guests including senior party officials, government ministers, foreign diplomats and representatives of ruling parties from Angola, Botswana, South Africa, Namibia and Tanzania.
"It should never be allowed to exist... We should remain united and use proper channels to solve our differences."
The long-time leader also used the opportunity to launch into a characteristic attack on the West.
The scale of the celebrations, costing a reported $800,000 this year, attracts annual controversy in Zimbabwe, which recently declared a "state of disaster" due to an ongoing regional drought and widespread food shortages.