You can give the query a different display name using a meta-data XML file that has the same base-name as your .sql file, but with a .query.xml extension. So for your particular example, create a file named demographicsAge.query.xml, and set the contents to this:

<query name="Age">
</query>

The <query> element may also contain a <description> sub-element and/or a <metadata> sub-element (which would contain the table info schema). See the query.xsd in the /schemas directory of the source for a complete schema definition.