Did the Bible say the Universe cannot be billions of years old? Where?
Not in so many words, but all of the begetting and begotting in the Bible adds up to approx 6k years.
Conversely, sin brought death and destruction to all the living creatures on Earth therefore when God declared His creation very good there was no death, disease nor corruption found in His creation.
I’m led to believe that at that time not even the devil nor his demons had fallen from grace.