The Longevity Index
How likely is your relationship to last?
For couples who'd rather know, and exes who want an autopsy.
Questions
What people ask before they start.
How is the score worked out?
Thirteen questions are scored against 43 long-term studies of 11,196 couples, weighted by how strongly each area predicted lasting relationships in that research. It shows where you stand on what tends to matter; it cannot see the two of you.
Is anything stored?
Your answers stay on your device so you can resume, and they are never sent to a server. A score link carries them in the part of the address that a server never sees.
What is the autopsy on an ex?
The same questions asked in the past tense, so you can see which areas carried the relationship and which one ended it.
How seriously should I take it?
As a mirror, not a verdict. No quiz can predict two specific people; this reflects patterns the research found across thousands of couples.
Where the score comes from
Area by area
Top bar is you. Bottom bar is them.
How the score works
Seven areas, weighted by how well each one predicted which couples lasted across 43 long-term studies of 11,196 couples.
| Area | Weight |
|---|---|
| Commitment & investment | 22% |
| Conflict & repair | 18% |
| Appreciation & connection | 16% |
| Intimacy & responsiveness | 12% |
| Shared future & money | 12% |
| Stress & social network | 10% |
| Individual security | 10% |
The three background questions move the score a few points at most. How you treat each other matters far more than demographics.