"Forever" is a tall order. But relationships that last 30, 40, 50 years share a remarkably consistent set of habits. Nineteen of them below — drawn from Gottman's four decades of research and from interviewing long-married couples about what they actually do.

Daily

1. Six-second kiss at hello and goodbye.
2. 20-minute stress-decompression conversation each evening — about work/life, not about the relationship.
3. Express gratitude for one specific thing the partner did today.
4. Non-sexual physical affection — hand on back, shoulder squeeze.
5. Phones down during meals together.

Weekly

6. A "state of the union" conversation — 20 minutes, what's working, what's not, what to try next week.
7. One deliberate shared activity — a meal out, a walk, a hobby.
8. Ask about their inner life, not just logistics.
9. Talk about something bigger than your day-to-day.

Conflict

10. Repair quickly after fights — don't let resentment sleep.
11. Use "I feel" rather than "you always."
12. Don't bring up old grievances mid-fight.
13. Take a break when escalation happens — agree on 20 minutes max, then return.

Respect

14. Speak well of them in public, always.
15. Never criticise them in front of family or friends.
16. Take their influence on decisions seriously.
17. Allow them to change over time without grudges.

Annual

18. Plan a real trip together, yearly if possible.
19. Have one honest conversation about the shape of your shared life every year — where you are, where you're going.

Nineteen habits is a long list. The couples who do all of them are rare; the couples who do twelve are common among the 30+ year relationships. Pick three you don't currently do well; practise them for a season; revisit. That's the actual path.