Depends on the domain name. Some names make sense, and others are just letters cobbled together. With the correct name you could even go to $XXXX and higher.
the age of the domain does not necessarily mean that its a high value name..thats actually a wrong perception in a lot of cases..infact the reason people think it is better because there are usually a lot of visitors on a site that is 12 years old..I am not an expert on this but I heard this from someone reliable
It depends on various factors like. Domain Name: Niche: Competition in the market for that niche: PR: Alexa: Backlinks: