Hey, maybe decades of downward pressure on real wages, the destruction of even the tissue of socially guaranteed retirement, and the artificial extension of the duration of the working life in response to these pressures has created a paucity of demand for new labor that has made economic independence economically unobtainable for young people. I'm just, you know, throwin' it out there. Maybe the near-total absence of even subsistence-level wages for people without an at-minimum four-year program of educational debt-indenturage is driving the upticking of the age of marriage and the formation of independent households just as much as "social acceptance of premarital sex." I'm just, you know, sayin'. Maybe the general trend of our society at all but the highest levels of class and income, which are principally inherited anyway, is toward debt-and-wage-peonage that is gradually reducing the viability of the independent household to exist at all.