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As people mature, genetic factors may strongly influence who they choose as their friends, a U.S. study finds.

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"As we grow and move out of our home environment, our genetically influenced temperament becomes more and more important in influencing the kinds of friends we like to hang out with," lead author Dr. Kenneth S. Kendler, professor of psychiatry and human genetics at Virginia Commonwealth University's School of Medicine, in Richmond, said in a prepared statement.

This kind of research may help improve understanding of who may be at risk for future substance abuse or other "externalizing" behaviors such as conduct and antisocial personality disorder, the researchers said.

"The study shows how genetic and family environmental factors influence the ways in which we create our own social environment as we grow," Kendler said. ¹

"Lika barn leka bäst", som man brukar säga.