According to Bishop James Ussher (1581-1656), God created the universe on October 23, 4004 BC. That would make the universe 6011 years old today.
“James Ussher was an Irish Archbishop whose chronology of Biblical history was widely accepted throughout Christianity. Based on an intricate correlation of Middle Eastern and Mediterranean histories and Holy writ, it was incorporated into an authorized version of the Bible printed in 1701, and thus came to be regarded with almost as much unquestioning reverence as the Bible itself. “
He even remembered to take into account the day that God stopped the rotation of earth so that Israel could “avenge themselves” against the Amorites. (They worshipped the Sun, so I guess that was God’s way of being funny.)