The Longevity Index
How likely is your relationship to last?
For couples who'd rather know, and exes who want an autopsy.
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.
Frequently asked questions
Where do these numbers come from?
The weights come from 43 long-term studies that followed 11,196 couples and recorded which ones lasted. Each of the seven areas counts in proportion to how well it predicted that. The exact table is under "How the score works" above.
What does the score actually mean?
Odds, not a verdict. A 62 means couples who answer the way you did stay together about six times in ten. The score tracks habits, and habits move, so a bad number is closer to a to-do list than a prophecy.
Do you keep my answers?
No. The quiz runs entirely in your browser. A half-finished quiz is saved on your own device so you can pick it up where you left off, and a share link carries your answers inside the link itself, so only people you send it to can see the result. Nothing reaches a server.
Is this serious?
The research behind the weights is real, and the advice comes from the same studies. It is still 13 questions pointed at something with a few thousand moving parts. Treat it as a well-sourced conversation starter, not a diagnosis.