Thanks for the quick reply. Please see my responses below:

1. There is currently a 1 page site on the original domain.

2. Yes, it will be related to the domain name. It will be a website for a small business.

3. There are only 5 backlinks to the site, All of which are nofollow links that come from two business directory websites.

4. A Google search does show that the site is indexed.

Hi,
I have the opportunity to build a new website and use a domain name that is older than 5 years or buy a new domain name. The aged domain name is a .net and includes a keyword.
The new domain would include the same keyword as well as the U.S. state abbreviation.

Which one would you use and why?

Thanks for your help!