It seems like people mature a lot slower, generally, the repsonsibilities that a 14 year old would have 100 years ago would be greater than an 18 year or or even 21+ year old today. In today's world, I don't advocate young marriage like that, heck, it would be like giving a 16 year old the keys to a Ferrari. B-) Still, it is an interesting observation how society has changed that much.
Call it what it is; Wealth. The average Joe or Jane in 21st century America has as much leisure time on his or her hands as any king or queen from centuries past.
I don't advocate returning to more primitive times when one worked from sunrise to sunset, six days a week, but I think it's safe to safe that socially, we've done a poor job of adapting to modern life which is less rigorous.
Rather than freeing us, the increase in leisure time seems to have shortened attention spans, increased boredom, and raised expectations in a lot of areas.
I think of the time I spend with my wife, compared to the time my father spent with my mother. There is no comparison, and I was born in 1963, so I'm not that old. Still, he saw my mother (conscious) a few hours a week at best. The rest of the time he was working or sleeping. That world is gone. We now look to spouses as sources of both entertainment and fulfillment.
I don't know whether it's good or not, but we've certainly raised the expections we have in marriage.