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Their wife is typically a woman arranged to be their wife from birth (men arrange their children's marriages at birth in many cases, often agreeing to exchange daughters between sons when all the parties involved are still infants or children) -- the wife is typically married (stage 1) when she is 14 or 15, two or three years before her first menstruation (which in a typical third-world, non-modern nutrition pattern occurs at the ages of 17 or 18).