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Quick Answer. The sex ratio is 107 males to 100 females, based on an estimated population of 7.17 billion people as of July 2014. Therefore, there are about 3.7 billion males in the world, and about 9.56 million of them are ages 14 and under. Continue Reading.
So now we would have to find out how many women are in that age group. According to [3], there are about 2 billion women world-wide in that age group. That would give you the answer of about 334 million. Note that this is only a very rough ballpark number, as we do not have exact information about the global average menstrual cycle length, the exact population numbers etc.