“am of the opinion (of course you are free to argue) that the younger a couple gets married, the less they are set in their ways, and the more they will be interested in agreement vs. stubornness.”
This is me, being free to argue ; GAW. How many kids of that age have you met????? Young kids are extremely set in their ways, their notions, the belief that they know it all. That is actually a description of a teen-early 20s kid. With age hopefully also comes the wisdom and maturity that lends itself to agreement vs. stubbornness. that is not to say that a 23 year old is mature, necessarily, but certainly moreso than the average 19 year old. I understand the point you are trying to make, but I think you are looking at an ideal situation, and most kids are far from ideal.