I believe a grave area of weakness supporting these young marriages is the lack of “community” at the local parish level.
Most (not all) local parishes now: hundreds of people at mass - most don’t know anyone. Life gets difficult, stop attending church, nobody even notices.
First communities: “The community of believers was of one heart and mind, and no one claimed that any of his possessions was his own, but they had everything in common.” Acts 4,32
Take physical ownership out of the verse and focus on the kind of united community described and we have a big call to be better at the local parishes level.