ANSWER: It isn’t millions of years old. It’s about three thousand years old; which is how long it’s been since flood waters covered the earth up to a distance above the highest peak that existed at that time.
Much more happened during the Noahic Flood than just lottsa water. The continental plates were shifted around, mountain ranges were pushed up, etc., and all that was followed by an Ice Age. But only THOUSANDS of years ago.
If it were millions of years old, the mountains wouldn’t still be jagged and sharp and new-looking. They’d have eroded away a long time ago.
Blessings.
It really annoys me to see people who consider themselves religious, put such puny limits on God’s awesome creations.