Allow me to assist. The Masoretic text is usually dated (the manuscript, not the source) to around 900A.D.
There are some extremely fragmentary manuscripts from a couple hundred years earlier in Cairo. The oldest complete manuscript is from just after 1,000 A.D.
The text of the manuscripts themselves, however, is not tainted by the reletive modern dating, since the Hebrew scrolls at Qumran show a remarkable similarity to the Masoretic age texts. The thousand intervening years did not seem to have a negative effect.