Why is it that most patriarchal parents are those born in the 40s and 50s?

First of all, those who were born before the 40s and 50s should be grandparents by now, and if you're observant, the grandparents are the same. Secondly, the feudal society period, the poor are test farming out of hard labor life, which have to be men to do, raise a daughter, can not do heavy work, there is no output, the family has no economic source, so the man is the pillar, so the status of the male child to be higher than the girl. Once again is the influence of the concept of succession, because of the previous reason, but also because of the primitive desire of human reproduction, resulting in the family must have the inheritance of the flame, the girl is always to be married off, married off is not the family, parents can not rely on them to support, a combination of many factors, so the preference for men over women. But after the founding of New China, the country is getting better and better, everyone can eat and wear warm, do not have to worry about survival, this concept will fade down, coupled with the adjustment of state policy, the imbalance of the proportion of men and women in society, as well as more and more women also showed outstanding social value, the status of girls slowly improved