I don't have any links, but off the top of my head and through countless documentaries, I recall that many physicians have already calculated the age of the Universe by the rate of expanding materials, making it a few billion years old.
Do you have a scientific reason to uphold your belief or is it based on faith?
First, all scientific reason that I have is based on faith. Theories are nothing more than models of reality. Anybody who partakes in science is putting faith that these theories are reasonable representations of reality, but that doesn't mean that those representations are reality, nor should it be taken the other way; they could very well be how things work. Therefore, everything that I state is based off of faith, even through science.
Plus, I mistyped what I had really meant. I believe in God, and I believe that God created the world and universe in seven days. Nonetheless, I have several theories as to how human existence could come into play (happen) - even without God - and only a couple theories as to how the universe could be created - once again, even without God - and I have only two (maybe could be three if I were to think hard enough) ideas as to how the matter came into existence.
Why I put that was what I believed is because I know that God could do it anyway he wanted to, but he did it in a way that wouldn't be lying (meaning he wasn't using a metaphor when he said 7 days), with the earth and universe being 10,000 years old, and the universe having a multi-billion year old history, according to the Bible (which I also have put faith towards being accurate). But, that isn't the only way I believe God could have created the earth in seven days, I have more ideas to as how he could have done it.