The children of older fathers score lower on I.Q. tests than those born to younger men, according to new research out this week.

In the study, children were given cognitive tests at ages 8 months, 4 years and 7 years. The results indicate that the older the father of the child, the worse the child scored. The age of the mother did not stimulate the same trend.

While the differences in I.Q. were slight, researchers say that the trend is significant. Already, science has linked older fathers to an increased risk of autism and schizophrenia, reports The New York Times. To read more click here.

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