Researchers from University of Colorado Denver found that those married to younger or older mates have on average lower earnings, lower cognitive abilities, are less educated and less attractive than couples of similar ages.
"Our results call into question the conventional wisdom regarding differently-aged couples," said Hani Mansour, an assistant professor of economics at the University of Colorado Denver and co-author of the study.
The study found that those married to older or younger spouses scored negatively in key areas like education, occupational wages, appearance and cognitive skills.
The economists examined US Census Bureau data from 1960 through 2000 looking at age at first marriage, completed education, occupational wages, and earnings.
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They also used the 1979 National Longitudinal Survey of Youth to measure cognitive skills and the National Longitudinal Survey of Adolescent Health (Add Health) to gauge physical attractiveness.
Their findings largely reflect the different networks that lower or higher ability individuals belong to.
By contrast, those who attend community colleges or work in low-skilled jobs with little chance of advancement are more likely to interact with more widely diverse age groups, increasing their chances of marrying someone significantly younger or older, according to the study published in the Review of Economics and Statistics journal.
The research also found that men married to younger or older spouses made less money than those married to women of a similar age.
Men with spouses at least eight years younger scored on average 8.4 points less than those who married women of a similar age. Women had less drastic drops in their scores.
Physical attractiveness was determined by interviewers conducting the Add Health survey.
"Overall, the estimates indicate that individuals married to differently-aged spouses are less attractive than those married to similarly-aged spouses, with the possible exception of men married to older women," the study said.