In the spirit in which i took your comments about an Old Earth, I believe that God created the universe with the appearance of age: trees and plants were fully grown, animals were created mature and prepared to reproduce after their kinds, and that Adam and then Eve were created adults, not infants...fully able to reproduce, think, converse (with each other and with God), and fully capable of undertaking the tasks God gave them - to reproduce (be fruitful and multiply) and fill the earth.
I agree.
Let me explain my position.
We know that certain things are scientifically explainable and required millions of years to happen. Plate tectonics. Volcanos. Erosion. Grand Canyon. Sea shell on the tops of mountains. Metamorphic rocks. Coal, oil, diamonds, etc.
I see the history of the universe as like a 1000 page novel. God created the whole thing and started us at page 984. There is a history of everything that happened.
Back to the case of Adam and Eve. It takes people a year to "learn" the muscle movements required to walk. Several years to "learn" to use the lips and tongue to create words. (Try to make Japanese or Arabic words if you learned English. Some require great effort and learning.) God created Adam and Eve with this history of "learning" built in.