How many women and men are in this world?

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In 2011 the world population was 7 billion people (women and men). Including 3 billion 500 million are women.
Do not believe now that women are much more, this imbalance occurs after age 50
years old after which women are more enduring.
The causes of this imbalance is the stressful chores heavier and they are subject to a large number of men, wars, migration, riots, abuse of alcohol and other harmful substances, overwork, etc.      

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