Most women were stuck at home, and were usually the ones to get an education. The had to work house work, or later work in many factories, with un equal pay. Many women had fought hard for their rights, but men saw women education not needed, as they felt all the women just need to supply food and take care of the children and house and nothing else.
The answer is 10 year-old. After a divorce, 10 year old child will fell pressured to choose between the mother and the father. The child may also experience a degree of divided loyalty, since a 10-year old is close to puberty and individuals who experience puberty have mental coping or mental changes, so as a 10 year old child, it would be hard for him/her to decide.