Well, I wasn sure if this was a bug or should I post a feature request, but I guess this is bug...
Articles don't age. If someone is a heavy downloader and has a big list it would be a very important feature, and such a feature is especially appreciated in a situation when someone downloads articles that are near-end of retention. I guess it's bugged now, since I suppose it should work. For example, I download DVD all day and its last RAR is permanently 6.7 days old (same situation with all other articles).