How old is the Old Testament? How old is the Old Testament and, like the New Testament, are there multiple versions (i.e. - according to Matthew, Mark, Luke &amp; John)?
There are not multiple versions of the new Testament. There is one version. The first four books happen to be four different accounts of the the same series of events but there are 27 books in total.  

How were the books of the New Testament chosen?
No, there is nothing equivalent to the four perspectives of the Gospel books in the Old testament, there is just one collection of books, accepted by both Christianity and Judaism, compiled in their present form in about 450BC then canonized in about 200BC but was written over a period of several thousand years before that and having gone through several redactions.

When was the OT canon as used by Protestants finalized?

There are a few passages where the same story is told more than once for the purpose of recording it from a different perspective, such as in the books of Kings and Chronicals.

On another note, the Old Testament is devoted to foreshadowing Christ. In that sense all the stories, all the crazy history of Israel and all the prophets are all telling the same story.


Really the best way to get your head around this is to read it through, then ask more questions about what it all means.