Zimbabwe votes on new constitution From Columbus Mavhunga, for CNN March 16, 2013 -- Updated 0620 GMT (1420 HKT) Harare, Zimbabwe (CNN) -- Zimbabweans are voting Saturday on a referendum for a new constitution that limits presidential terms for the first time in the African nation. President Robert Mugabe, 89, has been in power since the country gained independence from Britain. If approved, the constitution will give more powers to parliament, limiting the president's. It introduces a two-term limit of five years each for a president. The limit will not apply in retrospect, which means Mugabe has 10 more years as head of state if he is re-elected.