He lived a number of years AFTER expulsion not after being created.
He was immortal before expulsion, why would he count his age? And if he was more than a billion years old, how in the world would he keep track?
You see that is what is so amazing about the Bible, you can’t find a CLEAR falsehood in it. It never gets pinned down for fraud.
Of course there are things in it which defy belief, (parting of the Red Seas, Manna from Heaven, etc.). These things can’t be proven or disproven, but they can be believed or disbelieved.
But in a court of law, there is nothing in the Bible that can be pinned down for fraud or perjury. And I find that amazing.
So you’re saying there would have been dinosaurs in the Garden of Eden? If so, when did they become extinct and why? If they didn’t become extinct at that time were they on the Ark? Scripture tells us that Satan was the most glorious angel and “walked the earth”. When did that happen while Adam and Eve were alive?