Studies in Genesis1
In the beginning, God created the heavens. [Genesis 1:1 ESV]
Scientists, astronomers and others have dated the age of the universe as close to fourteen billion. In 2013 a group of astronomers saw a blur of light and through a series of tests determined it was the oldest galaxy yet discovered. 13.1 billion years old. Astronomers have suggested this galaxy came into existence a mere 670 million years after the Big-bang.
Throughout the history of the Church many Christians believed the universe was, at most, somewhere in the neighborhood of 6,000 years old. There is an ongoing disagreement over the age of the universe between old and young Earthers. This debate is a subterfuge meant to direct attention away from the God who created everything to speculations about when God created the universe. We are confronted with mysteries known only to God and cannot force Him to share these mysteries.
How old is God? He is timeless. We do not get to use words which signify time to describe God. When these words are used they misrepresent who He is. He is not constrained by time just as He is not constrained by space, or matter or energy or any other being.
He is infinitely larger than our universe. I imagine God holding the universe in His hand. Since He exists outside of the universe then the boundary of time has no effect upon Him. We must be careful to never think of Him as if He were created and constrained.