I believe with all my heart, God did NOT sit around His domain for eons of time contemplating what to do and how to do it. I believe with all my heart, God looked around, saw He was alone, and began His works of creation. Which leads me to conclude with all my heart, the Earth is ALMOST as old as God.
To disagree would require me to consider God too old to know what He wanted, and too far gone to make creative decisions without eons of time to bring them to fruition. I doubt that with all my heart.