The majority of NT manuscripts are similar to/the same as the Textus Receptus (what most old Bibles used as the source for translation, namely the KJV, Vulgate is similar, Douay-Rheims is therefore also similar).
Modern Bible translations have now turned to the newer discoveries of the Alexandrian text-types, namely the Codex Sinaiticus and the Codex Vaticanus.
Is the only reason these are seen as more reliable is because they date back to an earlier time? Why does age necessarily indicate how accurate/reliable the texts are? Does this mean the Church had a slightly imperfect Bible for much of its history, until we discovered these Alexandrian texts in the 18th century?
Is there more to the reliability/accuracy of the Alexandrian texts than this, other than age?