Well, if you listen God in the Old testament, all universe and our planet was created in 6 days!
If you ask Jews, earth is about 6 000 years old.
If you ask scientists, earth is about 4 billion years old.
So, what is truth?
In my opinion we should more believe in science than religion.
I'm also believer but I don't think that we should accept and believe everything in the Bible literally.
If God said he created everything in 6 days, it can means 6 periods or ages, what is in accordance with science.
After all, in other place in the bible it's said that in the eyes of god one day is like thousand years and thousand years is like one day.