Zimbabwean President Robert Mugabe is celebrating his 93rd birthday amid granite hills where ancient spirits are said to dwell, defying calls to resign after nearly four decades in power in a region known for opposing the man who says he’ll run again in 2018 elections. Thousands of government supporters, some wearing clothing adorned with Mugabe’s image, converged in Matabeleland on Saturday for a birthday bash and show of strength for the ruling ZANU-PF party, beset by squabbling in the past year as the elderly president weakened and factions, one including his wife Grace, sparred ahead of an expected power vacuum.