It was playful for God to create a Universe 10,000 years ago with abundant evidence of being more than 10 billion years old.
Jesus's first miracle was to create something with the appearance of age, wine.
If God decides to hang stars and galaxy's in the sky for lights and to tell the seasons by, why do you imply any other motive?
He wanted them, He made them. He gave us the timeline of creation. The fact that we don't understand how he did it or why he created them a certain way, and then we try to impose natural causes, and conclude that they must be old, is not His problem.
So if a year is as a thousand to God, then isn’t 10,000 years and 10,000,000,000 years pretty much the same time period!