Contrary to popular opinion, people who say they are still madly in love with their spouses after more than two decades are not crazy. At least, some of them aren't. And in answer to your next question, apparently they're not lying either. This is the proposition of a new study published in the December issue of Social Cognitive and Affective Neuroscience that took brain scans of long-married people who claimed to still be besotted with their marital partner.
Marriage's Effects On The Brain: What Your Cerebrum Looks Like 20 Years After 'I Do'