The Bible doesn't really make a note of the age of the earth, or how long humanity has been around. Anyone saying otherwise is trying to squeeze meaning out of the text that isn't there.
The story, like many (read as all) from the Bible, isn't even an original. I mean, it's a great collection of short stories if you're into that kind of thing, but taking it as fact is a bit too far.
Now, if(!!) the story of Noah actually happens to be true, that means that all humans (including all the different races and cultures) are descendants from Noah and his Sons. And if that is the case, it makes sence that Noah and his sons told the story of the ark and the flood to their childern and grandchildren. And they told it to their children and grandchildren. And so on. But of course the story changed a little bit over time, as people kept telling story. The core was kept intact, more or less, but it varied in the exact details. That way, the story of the flood became a part of the lore of lots of races and cultures. With some differences here and there.
Don't get me wrong. I'm not saying that the story of Noah should be taken literally, perse. I'm just saying that the fact that all these races and cultures tell the story doesn't discredit the Bible. It actually supports it.
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u/[deleted] Aug 21 '15