And future growth could be spurred by the continent's population doubling to two billion over the next 35 years, repeating in Africa the economic boom seen in Asia's biggest countries.
"Africa's gross domestic product (GDP) growth is expected to strengthen to 4.5 per cent in 2015 and 5.0 per cent in 2016 after subdued expansion in 2013 (of 3.5 per cent) and 2014 (3.9 per cent)," said the report, co-authored by the Organisation for Economic Co-operation and Development (OECD), the African Development Bank and the UN Development Programme (UNDP).
And if the commodity prices remain low, the report warned that the economies of resource-rich countries, such as leading oil exporters Nigeria and Angola, may slow down as their governments will inevitably have to trim spending.
The latest forecast is a downward revision from projections made in 2014 which suggested Africa's economy was going to expand by 5.7 per cent this year.
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At the same time, economists noted that Africa's increasing population could boost growth in much the same way that population booms fuelled development in China and India.
But, if Africa fails to absorb the enormous youth bulge in the labour market, "then you may have very strong tensions," he added.