The fact that Job. 38:4-8 shows God saying the universe was created after the angels were inherently proves this universe is a lot older than 6,000 years because that took place
before Lucifer's rebellion. Gen. 1:1 describes the original creation, while Gen. 1:2 and Rom. 8:19-21 describes the condition of Earth and other planets after Lucifer's rebellion. Other parts of the Bible like
Jude 1:6 shows Lucifer and the angels that were in his charge ruled this planet before humans existed. While Gen. 1:3-31 happened over the course of 6 literal days, this all took place years
after Lucifer's rebellion, which could've taken place millions of years after he was created. At no point does the Bible ever say Gen. 1:1-2:2:2 happened in 6 days. YECs simply assume it does because they ignore or overlook everything else the Bible says about that period.