Figure 2.9. Values of the “current state” flag
i - the package is installed and all its dependencies are satisfied.
p - the package and all its configuration files were removed, or the package was never installed.
Aptitude will automatically remove old versions when you install a new version. Dependencies are also automatically handled.
The screen shot you are showing indicates the versions you are asking about are fully removed, or have never been installed. The versions show up on the list because they are available. Likely the oldest version was likely included in the initial distribution. The other two versions likely come from update and/or backports repositories.
For more information, check out the documentation relating to accessing package information in aptitude.
Basically, those old versions are just available options from your package database. They don't exist on your system, and possibly never were there.
Aptitude will automatically remove old versions when you install a new version. Dependencies are also automatically handled.
The screen shot you are showing indicates the versions you are asking about are fully removed, or have never been installed. The versions show up on the list because they are available. Likely the oldest version was likely included in the initial distribution. The other two versions likely come from update and/or backports repositories.