Iranians voted on Friday in the country's first presidential election run-off, to select a successor to reformist President Mohammad Khatami, Reuters reported. Following are some facts and figures about the voting process. -- The run-off will be between pragmatic cleric Akbar Hashemi Rafsanjani, 70, and ultra-conservative Tehran Mayor Mahmoud Ahmadinejad, 48. -- The vote was required after, for the first time since Iran's 1979 Islamic revolution, none of the original seven candidates polled the minimum 50 percent required for an outright win. -- Rafsanjani polled 21 percent of votes in the first round, closely followed by Ahmadinejad with 19.5 percent. -- All Iranians over the age of 15 can vote. Some 46.8 million of Iran's 67 million inhabitants are eligible to vote. -- Turnout in the first round on June 17 was 63 percent, down from 69 percent in 2001 but well above turnouts in parliamentary and local council elections. -- The presidential term lasts for four years. Incumbents can stand for a second term after which they must step down for at least one presidential term. --More 1117 Local Time 0817 GMT