He was not in fact talking about recorded history. He was talking about the age of the Earth itself. And in Rubio's defense, he never actually said he believed the Earth to be less than 10,000 years old. He simply said that it's a "great mystery" and that different perspectives (biblical and otherwise) should be considered.
[EDIT]
Rubio's actual words:
“I’m not a scientist, man. I can tell you what recorded history says, I can tell you what the Bible says, but I think that’s a dispute amongst theologians and I think it has nothing to do with the gross domestic product or economic growth of the United States. I think the age of the universe has zero to do with how our economy is going to grow. I’m not a scientist. I don’t think I’m qualified to answer a question like that.
“At the end of the day, I think there are multiple theories out there on how the universe was created and I think this is a country where people should have the opportunity to teach them all. I think parents should be able to teach their kids what their faith says, what science says. Whether the Earth was created in 7 days, or 7 actual eras, I’m not sure we’ll ever be able to answer that. It’s one of the great mysteries.”
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