Q: Does the Bible give any indication on how old the Earth really is or when creation began? Everything we see today on television documentaries and learn in science class suggests the Earth is millions or billions of years old.
If you type the question "How old is the earth?" into Google, you will get the following answer: 4.54 billion years. It becomes pretty obvious that the theory of a very old earth is pretty much considered fact by most everyone in the scientific community. But there are also many reputable individuals who are skeptical of how those dates have been reached.
To answer your question directly, the only biblical method for deducing the age of the earth would be to read the various biblical accounts and attempt to compile a kind of chronology based on life spans and so forth. Many have attempted to do this, and the result has been a figure somewhere around 6,000 years. (Quite a difference from 4.5 billion, eh?)
The website from Answers in Genesis has compiled some excellent information on this question and I would encourage you to check it out.