A widely repeated claim holds that romantic love inevitably fades within a few years, but the scientific evidence tells a more nuanced story. The American Psychological Association has explicitly stated that "romantic love can last a lifetime," and longitudinal studies show that a meaningful subset of long-term couples maintain deep romantic attachment well into old age — not merely companionate friendship.
Neuroimaging research cited by Harvard Medical School is particularly striking: MRI scans conducted on couples married an average of 21 years revealed the same intensity of activity in dopamine-rich brain regions as seen in people who had just fallen in love. This directly challenges the notion that the neurological basis of romantic love has a hard expiration date.
The confusion often arises from conflating two distinct constructs. Passionate or intense early-stage love — characterized by obsessive thinking and euphoria — does tend to mellow within roughly 1–3 years, as researchers like Helen Fisher have noted. But romantic love more broadly, defined by deep attachment, desire, and partner-focused motivation, is a separate phenomenon that neuroscience and psychology show can endure for a lifetime in many relationships.