>>3If it is technically eternal then it is at least 13 billion years old, alright. Of course, I would suppose, 13 billion years is a long time? So you would agree with the preposition, that something eternal is also very old.
To more practical terms, any substance is very old. Then, at the beginning of our universe, when it was still very young, how old were our substances? Were they still very old or were they very young at the time? Yes, that depends on how long they predate our "Big Bang". If they were very young 'at the time', does that mean they were not eternal 'at the time'? And does that even make sense, that they become eternal at a certain point after having "lived" enough time? Does it make sense to say that something eternal is born and lives, or comes to being and persists?