A) G-d would have to "fake" putting photons in motion all across the universe, just to give the appearance of old age. G-d doesnt fake...or decieve.
B) The words in Genesis are Yom Echad..Day one..etc. The word Yom is like the word day in english. It can apply to an era. As in..." in the dinosaurs day...it was warmer" refering to an era of time.
If He decided to create a full grown oak tree in the middle of a forest, and the next day a biologist thoroughly examined it, would the tree be distinguishable from it’s acorn grown neighbour? Is He thus faking the biologist out? No, the biologist just doesn’t have access to all the information.
It’s the same thing about the universe. Science tells us it grew from an acorn, so to speak. That doesn’t preclude an omnipotent being from having created it in a day. If He did, He didn’t lie or fake us out- the info is right there in the bible.
And not apropos to you, but what’s with all the people in this thread assuming the universe/multiverse encompasses the Lord, and not the other way around?