But I asked what YOU believe... Do you believe it's only 6,000 years old?
Personally, your belief.
Hi, not the Coach but a Christian all the same so if I may?
I have no clue how old the earth is but I would imagine it is far older than 6,000 years. It's likely that this hunk of rock is millions of years old and to be honest I could care less either way.

The mental age of many of the people participating in this thread is likely to be far less than 6,000 years. Or even 12.

Science is great! It neither proves nor disproves the existence of God. It is what it is, i.e., science. You can't make a leap of faith in two jumps but any of us can make a fool of ourselves in a single sentence, myself included. No, I don't speak for Coach nor any other Christian here, but I tend to think that the majority of those that believe in the Christ really don't care about such things as how old the earth is or how long it really took for all this to come to pass. I look at it this way.
We don't tell our little ones everything, do we? We don't explain physics to babies. I have yet to meet a mother or father (Christian or Atheist) that admits to reading technical manuals to an infant for their bedtime story. Those children, those babies, would not understand a word.
How much more mankind? Certainly we've progressed since the time of Moses (regarded as the author of the first five books of the Old Testament) and while we are still children, Moses and those of his time were even more uneducated than are we. And so we have many of the stories from the Old Testament wherein things were explained in a fashion understandable for the time. If there is a God (and I choose to believe there is and that Jesus is His Son), all will be revealed in the full measure of time and our ability to understand it all.
Science neither adds to nor takes away from my faith. It does add to my life but then so too does my faith albeit in a different way and for different reasons.
Hopefully I have explained myself adequately. If any choose to belittle me for my faith, so be it. They're the ones acting as children.
Be well.