Does passionate love really only last 18 months to 3 years?

Not exactly. The 18-month-to-3-year figure, popularized by researchers like Helen Fisher, describes the fading of intense early infatuation — not romantic love itself. Studies published by the American Psychological Association show that romantic love can persist for years or even decades in long-term relationships.

The claim that passionate love lasts only 18 months to three years is widely repeated, but it refers specifically to the intense, obsessive early phase of a relationship — sometimes called "limerence" or infatuation — not romantic love as a whole. Psychologist Helen Fisher, one of the most cited sources for this figure, actually frames it as a popular belief held by psychologists, not a settled scientific law.

Fisher's own brain-scan research complicates the picture significantly. She studied long-married couples who still reported intense romantic love and found neurological patterns similar to those seen in new couples. The American Psychological Association (APA) has also published research by Bianca P. Acevedo and colleagues distinguishing passionate love (which includes anxiety and obsession) from romantic love (which can be calmer but equally intense), concluding that romantic love is not time-limited in the same way.

BBC Science Focus notes that scientists across disciplines broadly agree there is no fixed timeline for falling in or staying in love. The 18-months-to-3-years figure is best understood as a rough average for when early infatuation tends to mellow — not an expiration date on romantic love itself.

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