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Marriage customs or the availability of reindeer to support a new family (the Sami people are reindeer herders) might be the reason that more Sami marriages did not display the optimum age difference, Helle says.

Ultimately, it is the age at which the woman begins bearing children that is the biggest factor in survival, the paper in suggests: Younger women, in general, bear more healthy children.

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"We studied how parental age difference at marriage affected [families'] reproductive success among Sami people who married only once in their lifetime[s]," says ecologist Samuli Helle of the University of Turku in Finland.

"We found that marrying women 14.6 years younger maximized men's lifetime reproductive success—in other words, the number of offspring surviving to age 18." The researchers did this by examining church records of 700 marriages from the Utsjoki, Inari and Enontekiö populations from the 17th through 19th centuries (in order to eliminate the effects of modern medicine on child survival).

Marrying an older woman or much older man proved the most detrimental to reproductive success.

IMAGINE that the world consists of 20 men and 20 women, all of them heterosexual and in search of a mate.

Since the numbers are even, everyone can find a partner. You might not think this would make much difference. Somehow or other, she “steals” a man from one of her fellow women.

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