"I Have read that according to Biblical references ... Doesn't this imply the notion that the Bible isn't perfect at all?"
No. There is another, very obvious, possibility: perhaps whatever it was that you read isn't perfect.
It may very well be that the material you were reading was written by someone that misunderstood what the Bible actually says, and so it isn't the Bible that is imperfect.
The Bible itself doesn't say the Earth is only 6000 years old. It does imply that the seven days of creation happened somewhere around then, but it says nothing about the age of the Earth (or the rest of the universe).
There are other theories, compatible with a literal reading of the Bible, that don't require the universe to be only 6000 years old. One in particular is the "Gap Theory", which observes (among other things) that:
- There is an indeterminate amount of time between Genesis 1:1 and Genesis 1:2.
- The "was without form" in Genesis 1:2 should be translated as "became without form".
- The Hebrew word translated as "without form" is "tohu", and Isaiah 45:18 says that God "did not create it tohu".
- Lucifer ruled the Earth long before Man was created.