Your heart which is a poor thinker is almost saying the young are not keen to get married. On the other hand the mind says they are only delaying it. Yet if you apply even more thought to this the damning conclusion is that even greater numbers will end up not marrying at all vis-à-vis any earlier times.
Methinks they want it all but that is only possible for very few of them, and when push comes to shove their choice is to pursue their financial security.
For most of human existence marriage and raising a family were driven by economic necessity than love. Once you take away that the result is fewer marriages. Indeed the greatest poverty is the poverty of love.