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That was Sarah the wife of Abraham, who according to Genesis was ninety years old when she gave birth to Isaac (Genesis 17:17).
A generation is the time from the birth of a person, to the birth of his or her child. This can be anything from about 15-100 years.
There are no relationship between this 3 events, the probability to give birth to a girl can not be deduce from previous birth given by a women. So the probability that the third child will be a girl is the same for this woman as for any other woman, no matter what happened before. It's like rolling a dice, if one gets an ace and an ace, it does not change the chance to get another ace for the third roll, or a 2, or a 3,.... All the roll results are independent if the dice is not loaded
How many years a woman menstruates for depends on when she reaches menarche, when she reaches menopause, how often she is pregnant, whether she suppresses her menstrual cycles with hormonal birth control, if she has any health problems that prevents menstruation, and if she has a hysterectomy. On average women will menstruate from 13 years old to 55 years old.
The wife of Abraham, which is Sarah(Sarai), was the woman who gave birth to Isaac, the son that God had promised her, at the age of 90 years old. Sarah was mentioned throughout the book of Genesis starting in chapter eleven. Sarah was also mentioned in the books of Numbers chapter twenty-six, Isaiah chapter fifty-one, and Romans chapter nine.