This happened after he had refused to leave office during eight tense days that began with the military intervening in the governance of the country.
For the first time in decades, Mugabe spent his birthday alone with his wife Grace at home.
Since taking the reins, Mugabe's former deputy, current president Emmerson Mnangagwa, has promised the 2018 elections will be free, fair and credible.
Mugabe, a deposed leader of the country located in the southern part of Africa, was born on February 21st, 1924 - meaning he became 94 years on Wednesday.
However, despite the general lukewarm attitude towards Mugabe's 94th birthday, there have been tributes from his ZANU-PF party.
Mujuru's meeting with Mugabe coincided with the announcement of the formation of the NPF, which is said to be driven by the exiled G40 kingpins.
Zanu-PF spokesperson and acting information minister Simon Khaya Moyo said there would be no national activities to mark the day, but the party would send a cake and best wishes to the former president.
"The African Commission is mobilising partners so that they can actively support Zimbabwe in this process and also to have the elections", Mahamat said.
During the visit, Mahamat, who was accompanied by the AU commissioner for political affairs Minata Samate Cessouma, met Mnangagwa, some cabinet ministers and paid a courtesy call on Mugabe. Mugabe, he said, told him that he had resigned to ensure peace and development of Zimbabwe. Cessouma held discussions with officials from the Zimbabwe Electoral Commission.
The late former Zanu-PF secretary for youths, Josiah Tungamira, was the one instrumental in making 21 February a youth movement in 1986 where young people from all the country's provinces used to gather to commemorate the birth of the former leader.
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