There used to be a statistic floating around that couples who cohabitate before marriage were more likely to divorce.
It turns out that age matters. That study has since been updated: the older you are when you first cohabitate, the less likely an eventual marriage is going to fail.
So you wait until your late 20s or early 30s to move in with your partner -- but the story doesn't end there.
In a recent study of married and just-living-together couples, a researcher at the University of Virginia found that the brains of spouses responded better to stress than the brains of living-together couples.
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