The research, called Optimising The Marriage Market, appeared in the European Journal Of Operational Research, which usually analyses business decisions.
Academics including Dr Emmanuel Fragnière of the University of Bath studied interviews with 1,534 Swiss couples who were either married or in a serious relationship.
We are having so much fun together, but it feels so weird dating a guy who is 5 years younger! Maybe his lack of baggage will help you find your faith in relationships again. I just turned 34 myself and look younger than my age, so I'm normally approached by guys in their mid-20's (admittedly, being asked out by a 22 year old totally freaked me out).
Those where both are well educated are half as likely to divorce.
If the woman is better educated than the man, they are eight times as likely to stay together than the uneducated couple, and three times more secure than if the husband were more of a bookworm than the wife.
Meanwhile, US President Barack Obama, 48, and wife Michelle, 45, may have only a three-year difference in age but have been married for 17 years.
But the study may not be welcomed by Michael Douglas, 65, and his 40-year-old wife Catherine Zeta-Jones – the research suggests a marriage is more likely to fail if only one partner has been previously divorced, and Douglas was married once before.
' ' Liberal arts.' [Crickets chirping] Ultimately, as hot as he was, I just couldn't deal with how dumbed down he was." — Yasmin, 304.