Ok this is not scientific but, God always works via a system of numbers. Numbers are very significant in the Bible. Such as 40 days of rain in the noah storey, and 40 years in the wilderness. 40 being the number of testing. Other significant numbers are 6,7,8,10 and 12 amoung others.
In the Bible 6 is the number of man
7 is the number of perfection. For example it was given men to work 6 days, also God created the world in 6 days as a home for his creation man and rested on the 7th Day.
In my opinion I believe the world is around 6-8 thousand years old.
I believe that God has given man 6,000 years on the earth and then Jesus will return and spend 1,000 years ruling the earth. I think it was 2,000 years from moses to abraham, then 2,000 years from abraham to the birth of Jesus, and now we are just over 2,000 years from the birth of Jesus.
There seems to be in Genesis an alluding to a period of time before the creation of the world as we know it, when the earth was dark and without form. But I dont think we can put a time on that either short or long from the text.