Accompanied by a much earlier death rate for both parties, often around the time their oldest child was finally capable of taking over the farm. Back then, many women died in childbirth around the sixth or seventh child, or even earlier.
That said, I'm not in favor of over intellectualizing the mate selection process; but I believe there could and should be reasonable practical marriage education for young people—life goals, mate selection, effective communication, conflict resolution, finance and budgeting, childrearing issues, etc— developed as a curriculum in churches.
Who would be in charge of that reasonable practical marriage education?