I found a chart here of median age at first marriage by year from 1890 to 2010. It looks like it dips to a low during the 60s then has an upward trend until 2010.
As an answer, I'm looking for any previous economic research about the causes of this trend. I'm also looking for data and theories that might shed light to this trend.
And if anyone can give a summary of proposed causes of this trend, I'd also appreciate that.
Background/side note There are other demographic trends coming from that pivotal time too, like more women in the work force, more women in college. I would have thought this kind of integration would make the marriage market more efficient and lower/hold constant that age. I guess there are changing preferences and less demand for marriage until later ages nowadays? People fall in love later? Or school and work are bad places to find a partner? Those are just some of my thoughts I'd like to get more info on.
extra note I disagree with people who don't include marriage as an acceptable topic for economics. But they might be kind of right. Marriage is a topic for sociology. To clear this up though, I'm just looking for the information that the discipline of economics can provide. So no, this isn't a sociology question, even though the two overlap. See comments below. Feel free to edit this question if it needs further clarification or narrowing, etc.