Zimbabwe's Constitutional Court outlawed child marriages decreeing that any person who intends to get married should be at least 18 years of age.
Mr. Mugabe was set to arrive before midnight but at the time of going on air he had not yet arrived in the country.
The main opposition Movement for Democratic Change charges that this is meant to purge its supporters ahead of the 2018 polls.
The opposition MDC formation led by Professor Welshman Ncube on Friday condemned the partisan distribution of food aid by Zanu PF elements, calling it "criminal" and "satanic."
In a move to avert a severe food crisis, Zimbabwe said it has secured a $200 million loan from the African Export-Import Bank to buy grain from outside the country.
They say the disruption of their vacation is forcing them to fork out money from their pockets, something they cannot afford due to non-payment of 2015 bonuses.
Ruvimbo Tsopodzi said she is happy that the Constitutional Court outlawed early child marriages, which had become common in Zimbabwe.
"The president must use that money for buying maize and other foodstuffs for starving villagers instead of hosting a flamboyant birthday."
Takavafira Zhou, president of the Progressive Teachers' Union of Zimbabwe, said the minister’s remarks were disturbing.
The ruling follows an application by human rights lawyers who wanted legal age of marriage be moved to 18 for both men and women.