I have no idea why I have my address. Thanks for pointing that out, will definitely remove that in future. I guess it's at least useful for companies to know which country I am currently residing in.

I've heard mixed things about personal details including age, gender and nationality. Some argue that it's a problem for companies with regards to abiding with discrimination acts (especially US). I include nationality as most of my applications are abroad and my nationality gives some indication of visa requirements.

In the US, employers aren't allowed to ask for that information for legal reasons; as such, it's typically considered inappropriate for a candidate to furnish that information.