The Short Answer
The biggest difference is usually not the amount of hardship a couple faces, since nearly every long marriage faces real hardship, but how consistently both partners kept repairing the relationship after conflict and kept actively choosing each other through changing seasons of life. Marriages that grow stronger tend to treat difficulty as something to work through together, while marriages that fall apart often let unresolved hurt accumulate quietly over time.
What This Question May Really Be About
Someone asking this is often trying to figure out which category their own marriage is likely to fall into, sometimes with real anxiety about whether current struggles are a normal part of the process or an early sign of the more troubling outcome. Others are simply trying to understand what actually distinguishes couples who make it well from couples who do not, since both groups usually go through genuinely hard periods.
What Actually Predicts the Difference
Couples who grow stronger with age tend to consistently repair after conflict rather than letting arguments go unresolved, and they tend to keep actively investing attention and effort in the relationship even during demanding life stages rather than assuming the relationship will simply take care of itself. Couples who fall apart more often accumulate a long backlog of unresolved hurt and unmet needs, with each partner privately keeping score rather than addressing issues directly as they arise, until the accumulated weight eventually becomes too much to easily repair.
Separating Facts From Fears
The fact might be: we are currently going through a genuinely hard period in our marriage. The fear might be: this means we are heading toward the group of marriages that fall apart rather than the group that grows stronger. A hard period on its own does not predict which outcome you are heading toward. What predicts it is whether you are actively repairing and reinvesting during that hard period, which is a choice available to you regardless of how difficult things currently feel.
What This Does and Does Not Mean
Going through hardship does not mean your marriage is destined to fall apart, since essentially every marriage that grows stronger with age has passed through real hardship along the way. It does mean that how you respond to hardship right now, whether you repair and reinvest or let things quietly accumulate, matters more than the hardship itself in determining which direction your marriage ultimately moves.
What You Can Actually Do
Make repair after conflict a consistent habit rather than an occasional exception, actually returning to resolve disagreements rather than letting them fade into unspoken tension. It also helps to periodically and honestly assess whether you are still actively investing in the relationship, attention, appreciation, shared time, or whether that investment has quietly lapsed during a demanding season, since noticing the lapse early makes it far easier to correct.
How to Talk About It With Your Spouse
Raise it as a shared commitment rather than a warning: I want us to be the kind of couple that gets stronger with time, and I know that means actually repairing things instead of letting them pile up. Can we commit to that together? This framing turns a somewhat abstract fear into a concrete, shared practice you can both actually act on.
What to Watch For
A hopeful sign is that both of you are still willing to repair after conflict, even if it takes practice and does not always go smoothly. A more concerning sign is a growing backlog of unresolved hurt that neither of you is addressing, or a pattern where one or both partners have quietly stopped reinvesting in the relationship during a difficult stretch.
When to Seek Additional Help
A couples therapist can help you build consistent repair habits and identify where unaddressed hurt may already be accumulating, which is often easier to catch and correct with outside perspective than from inside the relationship alone.
Bottom Line
Marriages that grow stronger with age are not the ones that avoided hardship, they are the ones that consistently repaired after conflict and kept reinvesting in each other through it. That is a set of habits available to any couple willing to practice them, regardless of how difficult the current season feels.
